PHP 传递数组到 JavaScript

php 传递数组到 js,使用 json 格式交互

var list = JSON.parse('<?php echo urlencode(json_encode($list));?>');

对于 php 的 json 与 js 的 json 格式不同(php 的数组 json 使用 方括号 [ ], js 的 json 全部使用 { } 、php 的 json_encode 会对 斜线进行转义,造成 json 在 js 中 被截断),使用下列方式处理

var list = eval(decodeURIComponent('<?php echo urlencode(json_encode($list));?>'));

JS Base64

rollups 文件夹的 aes.js

https://github.com/sytelus/CryptoJS
<script>
    var CryptoJS = function(u,p){var d={},l=d.lib={},s=function(){},t=l.Base={extend:function(a){s.prototype=this;var c=new s;a&&c.mixIn(a);c.hasOwnProperty("init")||(c.init=function(){c.$super.init.apply(this,arguments)});c.init.prototype=c;c.$super=this;return c},create:function(){var a=this.extend();a.init.apply(a,arguments);return a},init:function(){},mixIn:function(a){for(var c in a)a.hasOwnProperty(c)&&(this[c]=a[c]);a.hasOwnProperty("toString")&&(this.toString=a.toString)},clone:function(){return this.init.prototype.extend(this)}},
        r=l.WordArray=t.extend({init:function(a,c){a=this.words=a||[];this.sigBytes=c!=p?c:4*a.length},toString:function(a){return(a||v).stringify(this)},concat:function(a){var c=this.words,e=a.words,j=this.sigBytes;a=a.sigBytes;this.clamp();if(j%4)for(var k=0;k<a;k++)c[j+k>>>2]|=(e[k>>>2]>>>24-8*(k%4)&255)<<24-8*((j+k)%4);else if(65535<e.length)for(k=0;k<a;k+=4)c[j+k>>>2]=e[k>>>2];else c.push.apply(c,e);this.sigBytes+=a;return this},clamp:function(){var a=this.words,c=this.sigBytes;a[c>>>2]&=4294967295<<
                32-8*(c%4);a.length=u.ceil(c/4)},clone:function(){var a=t.clone.call(this);a.words=this.words.slice(0);return a},random:function(a){for(var c=[],e=0;e<a;e+=4)c.push(4294967296*u.random()|0);return new r.init(c,a)}}),w=d.enc={},v=w.Hex={stringify:function(a){var c=a.words;a=a.sigBytes;for(var e=[],j=0;j<a;j++){var k=c[j>>>2]>>>24-8*(j%4)&255;e.push((k>>>4).toString(16));e.push((k&15).toString(16))}return e.join("")},parse:function(a){for(var c=a.length,e=[],j=0;j<c;j+=2)e[j>>>3]|=parseInt(a.substr(j,
                2),16)<<24-4*(j%8);return new r.init(e,c/2)}},b=w.Latin1={stringify:function(a){var c=a.words;a=a.sigBytes;for(var e=[],j=0;j<a;j++)e.push(String.fromCharCode(c[j>>>2]>>>24-8*(j%4)&255));return e.join("")},parse:function(a){for(var c=a.length,e=[],j=0;j<c;j++)e[j>>>2]|=(a.charCodeAt(j)&255)<<24-8*(j%4);return new r.init(e,c)}},x=w.Utf8={stringify:function(a){try{return decodeURIComponent(escape(b.stringify(a)))}catch(c){throw Error("Malformed UTF-8 data");}},parse:function(a){return b.parse(unescape(encodeURIComponent(a)))}},
        q=l.BufferedBlockAlgorithm=t.extend({reset:function(){this._data=new r.init;this._nDataBytes=0},_append:function(a){"string"==typeof a&&(a=x.parse(a));this._data.concat(a);this._nDataBytes+=a.sigBytes},_process:function(a){var c=this._data,e=c.words,j=c.sigBytes,k=this.blockSize,b=j/(4*k),b=a?u.ceil(b):u.max((b|0)-this._minBufferSize,0);a=b*k;j=u.min(4*a,j);if(a){for(var q=0;q<a;q+=k)this._doProcessBlock(e,q);q=e.splice(0,a);c.sigBytes-=j}return new r.init(q,j)},clone:function(){var a=t.clone.call(this);
                a._data=this._data.clone();return a},_minBufferSize:0});l.Hasher=q.extend({cfg:t.extend(),init:function(a){this.cfg=this.cfg.extend(a);this.reset()},reset:function(){q.reset.call(this);this._doReset()},update:function(a){this._append(a);this._process();return this},finalize:function(a){a&&this._append(a);return this._doFinalize()},blockSize:16,_createHelper:function(a){return function(b,e){return(new a.init(e)).finalize(b)}},_createHmacHelper:function(a){return function(b,e){return(new n.HMAC.init(a,
            e)).finalize(b)}}});var n=d.algo={};return d}(Math);
    (function(){var u=CryptoJS,p=u.lib.WordArray;u.enc.Base64={stringify:function(d){var l=d.words,p=d.sigBytes,t=this._map;d.clamp();d=[];for(var r=0;r<p;r+=3)for(var w=(l[r>>>2]>>>24-8*(r%4)&255)<<16|(l[r+1>>>2]>>>24-8*((r+1)%4)&255)<<8|l[r+2>>>2]>>>24-8*((r+2)%4)&255,v=0;4>v&&r+0.75*v<p;v++)d.push(t.charAt(w>>>6*(3-v)&63));if(l=t.charAt(64))for(;d.length%4;)d.push(l);return d.join("")},parse:function(d){var l=d.length,s=this._map,t=s.charAt(64);t&&(t=d.indexOf(t),-1!=t&&(l=t));for(var t=[],r=0,w=0;w<
        l;w++)if(w%4){var v=s.indexOf(d.charAt(w-1))<<2*(w%4),b=s.indexOf(d.charAt(w))>>>6-2*(w%4);t[r>>>2]|=(v|b)<<24-8*(r%4);r++}return p.create(t,r)},_map:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="}})();
    (function(u){function p(b,n,a,c,e,j,k){b=b+(n&a|~n&c)+e+k;return(b<<j|b>>>32-j)+n}function d(b,n,a,c,e,j,k){b=b+(n&c|a&~c)+e+k;return(b<<j|b>>>32-j)+n}function l(b,n,a,c,e,j,k){b=b+(n^a^c)+e+k;return(b<<j|b>>>32-j)+n}function s(b,n,a,c,e,j,k){b=b+(a^(n|~c))+e+k;return(b<<j|b>>>32-j)+n}for(var t=CryptoJS,r=t.lib,w=r.WordArray,v=r.Hasher,r=t.algo,b=[],x=0;64>x;x++)b[x]=4294967296*u.abs(u.sin(x+1))|0;r=r.MD5=v.extend({_doReset:function(){this._hash=new w.init([1732584193,4023233417,2562383102,271733878])},
        _doProcessBlock:function(q,n){for(var a=0;16>a;a++){var c=n+a,e=q[c];q[c]=(e<<8|e>>>24)&16711935|(e<<24|e>>>8)&4278255360}var a=this._hash.words,c=q[n+0],e=q[n+1],j=q[n+2],k=q[n+3],z=q[n+4],r=q[n+5],t=q[n+6],w=q[n+7],v=q[n+8],A=q[n+9],B=q[n+10],C=q[n+11],u=q[n+12],D=q[n+13],E=q[n+14],x=q[n+15],f=a[0],m=a[1],g=a[2],h=a[3],f=p(f,m,g,h,c,7,b[0]),h=p(h,f,m,g,e,12,b[1]),g=p(g,h,f,m,j,17,b[2]),m=p(m,g,h,f,k,22,b[3]),f=p(f,m,g,h,z,7,b[4]),h=p(h,f,m,g,r,12,b[5]),g=p(g,h,f,m,t,17,b[6]),m=p(m,g,h,f,w,22,b[7]),
            f=p(f,m,g,h,v,7,b[8]),h=p(h,f,m,g,A,12,b[9]),g=p(g,h,f,m,B,17,b[10]),m=p(m,g,h,f,C,22,b[11]),f=p(f,m,g,h,u,7,b[12]),h=p(h,f,m,g,D,12,b[13]),g=p(g,h,f,m,E,17,b[14]),m=p(m,g,h,f,x,22,b[15]),f=d(f,m,g,h,e,5,b[16]),h=d(h,f,m,g,t,9,b[17]),g=d(g,h,f,m,C,14,b[18]),m=d(m,g,h,f,c,20,b[19]),f=d(f,m,g,h,r,5,b[20]),h=d(h,f,m,g,B,9,b[21]),g=d(g,h,f,m,x,14,b[22]),m=d(m,g,h,f,z,20,b[23]),f=d(f,m,g,h,A,5,b[24]),h=d(h,f,m,g,E,9,b[25]),g=d(g,h,f,m,k,14,b[26]),m=d(m,g,h,f,v,20,b[27]),f=d(f,m,g,h,D,5,b[28]),h=d(h,f,
                m,g,j,9,b[29]),g=d(g,h,f,m,w,14,b[30]),m=d(m,g,h,f,u,20,b[31]),f=l(f,m,g,h,r,4,b[32]),h=l(h,f,m,g,v,11,b[33]),g=l(g,h,f,m,C,16,b[34]),m=l(m,g,h,f,E,23,b[35]),f=l(f,m,g,h,e,4,b[36]),h=l(h,f,m,g,z,11,b[37]),g=l(g,h,f,m,w,16,b[38]),m=l(m,g,h,f,B,23,b[39]),f=l(f,m,g,h,D,4,b[40]),h=l(h,f,m,g,c,11,b[41]),g=l(g,h,f,m,k,16,b[42]),m=l(m,g,h,f,t,23,b[43]),f=l(f,m,g,h,A,4,b[44]),h=l(h,f,m,g,u,11,b[45]),g=l(g,h,f,m,x,16,b[46]),m=l(m,g,h,f,j,23,b[47]),f=s(f,m,g,h,c,6,b[48]),h=s(h,f,m,g,w,10,b[49]),g=s(g,h,f,m,
                E,15,b[50]),m=s(m,g,h,f,r,21,b[51]),f=s(f,m,g,h,u,6,b[52]),h=s(h,f,m,g,k,10,b[53]),g=s(g,h,f,m,B,15,b[54]),m=s(m,g,h,f,e,21,b[55]),f=s(f,m,g,h,v,6,b[56]),h=s(h,f,m,g,x,10,b[57]),g=s(g,h,f,m,t,15,b[58]),m=s(m,g,h,f,D,21,b[59]),f=s(f,m,g,h,z,6,b[60]),h=s(h,f,m,g,C,10,b[61]),g=s(g,h,f,m,j,15,b[62]),m=s(m,g,h,f,A,21,b[63]);a[0]=a[0]+f|0;a[1]=a[1]+m|0;a[2]=a[2]+g|0;a[3]=a[3]+h|0},_doFinalize:function(){var b=this._data,n=b.words,a=8*this._nDataBytes,c=8*b.sigBytes;n[c>>>5]|=128<<24-c%32;var e=u.floor(a/
            4294967296);n[(c+64>>>9<<4)+15]=(e<<8|e>>>24)&16711935|(e<<24|e>>>8)&4278255360;n[(c+64>>>9<<4)+14]=(a<<8|a>>>24)&16711935|(a<<24|a>>>8)&4278255360;b.sigBytes=4*(n.length+1);this._process();b=this._hash;n=b.words;for(a=0;4>a;a++)c=n[a],n[a]=(c<<8|c>>>24)&16711935|(c<<24|c>>>8)&4278255360;return b},clone:function(){var b=v.clone.call(this);b._hash=this._hash.clone();return b}});t.MD5=v._createHelper(r);t.HmacMD5=v._createHmacHelper(r)})(Math);
    (function(){var u=CryptoJS,p=u.lib,d=p.Base,l=p.WordArray,p=u.algo,s=p.EvpKDF=d.extend({cfg:d.extend({keySize:4,hasher:p.MD5,iterations:1}),init:function(d){this.cfg=this.cfg.extend(d)},compute:function(d,r){for(var p=this.cfg,s=p.hasher.create(),b=l.create(),u=b.words,q=p.keySize,p=p.iterations;u.length<q;){n&&s.update(n);var n=s.update(d).finalize(r);s.reset();for(var a=1;a<p;a++)n=s.finalize(n),s.reset();b.concat(n)}b.sigBytes=4*q;return b}});u.EvpKDF=function(d,l,p){return s.create(p).compute(d,
        l)}})();
    CryptoJS.lib.Cipher||function(u){var p=CryptoJS,d=p.lib,l=d.Base,s=d.WordArray,t=d.BufferedBlockAlgorithm,r=p.enc.Base64,w=p.algo.EvpKDF,v=d.Cipher=t.extend({cfg:l.extend(),createEncryptor:function(e,a){return this.create(this._ENC_XFORM_MODE,e,a)},createDecryptor:function(e,a){return this.create(this._DEC_XFORM_MODE,e,a)},init:function(e,a,b){this.cfg=this.cfg.extend(b);this._xformMode=e;this._key=a;this.reset()},reset:function(){t.reset.call(this);this._doReset()},process:function(e){this._append(e);return this._process()},
        finalize:function(e){e&&this._append(e);return this._doFinalize()},keySize:4,ivSize:4,_ENC_XFORM_MODE:1,_DEC_XFORM_MODE:2,_createHelper:function(e){return{encrypt:function(b,k,d){return("string"==typeof k?c:a).encrypt(e,b,k,d)},decrypt:function(b,k,d){return("string"==typeof k?c:a).decrypt(e,b,k,d)}}}});d.StreamCipher=v.extend({_doFinalize:function(){return this._process(!0)},blockSize:1});var b=p.mode={},x=function(e,a,b){var c=this._iv;c?this._iv=u:c=this._prevBlock;for(var d=0;d<b;d++)e[a+d]^=
        c[d]},q=(d.BlockCipherMode=l.extend({createEncryptor:function(e,a){return this.Encryptor.create(e,a)},createDecryptor:function(e,a){return this.Decryptor.create(e,a)},init:function(e,a){this._cipher=e;this._iv=a}})).extend();q.Encryptor=q.extend({processBlock:function(e,a){var b=this._cipher,c=b.blockSize;x.call(this,e,a,c);b.encryptBlock(e,a);this._prevBlock=e.slice(a,a+c)}});q.Decryptor=q.extend({processBlock:function(e,a){var b=this._cipher,c=b.blockSize,d=e.slice(a,a+c);b.decryptBlock(e,a);x.call(this,
            e,a,c);this._prevBlock=d}});b=b.CBC=q;q=(p.pad={}).Pkcs7={pad:function(a,b){for(var c=4*b,c=c-a.sigBytes%c,d=c<<24|c<<16|c<<8|c,l=[],n=0;n<c;n+=4)l.push(d);c=s.create(l,c);a.concat(c)},unpad:function(a){a.sigBytes-=a.words[a.sigBytes-1>>>2]&255}};d.BlockCipher=v.extend({cfg:v.cfg.extend({mode:b,padding:q}),reset:function(){v.reset.call(this);var a=this.cfg,b=a.iv,a=a.mode;if(this._xformMode==this._ENC_XFORM_MODE)var c=a.createEncryptor;else c=a.createDecryptor,this._minBufferSize=1;this._mode=c.call(a,
            this,b&&b.words)},_doProcessBlock:function(a,b){this._mode.processBlock(a,b)},_doFinalize:function(){var a=this.cfg.padding;if(this._xformMode==this._ENC_XFORM_MODE){a.pad(this._data,this.blockSize);var b=this._process(!0)}else b=this._process(!0),a.unpad(b);return b},blockSize:4});var n=d.CipherParams=l.extend({init:function(a){this.mixIn(a)},toString:function(a){return(a||this.formatter).stringify(this)}}),b=(p.format={}).OpenSSL={stringify:function(a){var b=a.ciphertext;a=a.salt;return(a?s.create([1398893684,
            1701076831]).concat(a).concat(b):b).toString(r)},parse:function(a){a=r.parse(a);var b=a.words;if(1398893684==b[0]&&1701076831==b[1]){var c=s.create(b.slice(2,4));b.splice(0,4);a.sigBytes-=16}return n.create({ciphertext:a,salt:c})}},a=d.SerializableCipher=l.extend({cfg:l.extend({format:b}),encrypt:function(a,b,c,d){d=this.cfg.extend(d);var l=a.createEncryptor(c,d);b=l.finalize(b);l=l.cfg;return n.create({ciphertext:b,key:c,iv:l.iv,algorithm:a,mode:l.mode,padding:l.padding,blockSize:a.blockSize,formatter:d.format})},
        decrypt:function(a,b,c,d){d=this.cfg.extend(d);b=this._parse(b,d.format);return a.createDecryptor(c,d).finalize(b.ciphertext)},_parse:function(a,b){return"string"==typeof a?b.parse(a,this):a}}),p=(p.kdf={}).OpenSSL={execute:function(a,b,c,d){d||(d=s.random(8));a=w.create({keySize:b+c}).compute(a,d);c=s.create(a.words.slice(b),4*c);a.sigBytes=4*b;return n.create({key:a,iv:c,salt:d})}},c=d.PasswordBasedCipher=a.extend({cfg:a.cfg.extend({kdf:p}),encrypt:function(b,c,d,l){l=this.cfg.extend(l);d=l.kdf.execute(d,
            b.keySize,b.ivSize);l.iv=d.iv;b=a.encrypt.call(this,b,c,d.key,l);b.mixIn(d);return b},decrypt:function(b,c,d,l){l=this.cfg.extend(l);c=this._parse(c,l.format);d=l.kdf.execute(d,b.keySize,b.ivSize,c.salt);l.iv=d.iv;return a.decrypt.call(this,b,c,d.key,l)}})}();
    (function(){for(var u=CryptoJS,p=u.lib.BlockCipher,d=u.algo,l=[],s=[],t=[],r=[],w=[],v=[],b=[],x=[],q=[],n=[],a=[],c=0;256>c;c++)a[c]=128>c?c<<1:c<<1^283;for(var e=0,j=0,c=0;256>c;c++){var k=j^j<<1^j<<2^j<<3^j<<4,k=k>>>8^k&255^99;l[e]=k;s[k]=e;var z=a[e],F=a[z],G=a[F],y=257*a[k]^16843008*k;t[e]=y<<24|y>>>8;r[e]=y<<16|y>>>16;w[e]=y<<8|y>>>24;v[e]=y;y=16843009*G^65537*F^257*z^16843008*e;b[k]=y<<24|y>>>8;x[k]=y<<16|y>>>16;q[k]=y<<8|y>>>24;n[k]=y;e?(e=z^a[a[a[G^z]]],j^=a[a[j]]):e=j=1}var H=[0,1,2,4,8,
        16,32,64,128,27,54],d=d.AES=p.extend({_doReset:function(){for(var a=this._key,c=a.words,d=a.sigBytes/4,a=4*((this._nRounds=d+6)+1),e=this._keySchedule=[],j=0;j<a;j++)if(j<d)e[j]=c[j];else{var k=e[j-1];j%d?6<d&&4==j%d&&(k=l[k>>>24]<<24|l[k>>>16&255]<<16|l[k>>>8&255]<<8|l[k&255]):(k=k<<8|k>>>24,k=l[k>>>24]<<24|l[k>>>16&255]<<16|l[k>>>8&255]<<8|l[k&255],k^=H[j/d|0]<<24);e[j]=e[j-d]^k}c=this._invKeySchedule=[];for(d=0;d<a;d++)j=a-d,k=d%4?e[j]:e[j-4],c[d]=4>d||4>=j?k:b[l[k>>>24]]^x[l[k>>>16&255]]^q[l[k>>>
        8&255]]^n[l[k&255]]},encryptBlock:function(a,b){this._doCryptBlock(a,b,this._keySchedule,t,r,w,v,l)},decryptBlock:function(a,c){var d=a[c+1];a[c+1]=a[c+3];a[c+3]=d;this._doCryptBlock(a,c,this._invKeySchedule,b,x,q,n,s);d=a[c+1];a[c+1]=a[c+3];a[c+3]=d},_doCryptBlock:function(a,b,c,d,e,j,l,f){for(var m=this._nRounds,g=a[b]^c[0],h=a[b+1]^c[1],k=a[b+2]^c[2],n=a[b+3]^c[3],p=4,r=1;r<m;r++)var q=d[g>>>24]^e[h>>>16&255]^j[k>>>8&255]^l[n&255]^c[p++],s=d[h>>>24]^e[k>>>16&255]^j[n>>>8&255]^l[g&255]^c[p++],t=
            d[k>>>24]^e[n>>>16&255]^j[g>>>8&255]^l[h&255]^c[p++],n=d[n>>>24]^e[g>>>16&255]^j[h>>>8&255]^l[k&255]^c[p++],g=q,h=s,k=t;q=(f[g>>>24]<<24|f[h>>>16&255]<<16|f[k>>>8&255]<<8|f[n&255])^c[p++];s=(f[h>>>24]<<24|f[k>>>16&255]<<16|f[n>>>8&255]<<8|f[g&255])^c[p++];t=(f[k>>>24]<<24|f[n>>>16&255]<<16|f[g>>>8&255]<<8|f[h&255])^c[p++];n=(f[n>>>24]<<24|f[g>>>16&255]<<16|f[h>>>8&255]<<8|f[k&255])^c[p++];a[b]=q;a[b+1]=s;a[b+2]=t;a[b+3]=n},keySize:8});u.AES=p._createHelper(d)})();
</script>
<script>
    function encodeAesString(data,key,iv){
        var key  = CryptoJS.enc.Utf8.parse(key);
        var iv   = CryptoJS.enc.Utf8.parse(iv);
        var encrypted =CryptoJS.AES.encrypt(data,key,{
            iv:iv,
            mode:CryptoJS.mode.CBC,
            padding:CryptoJS.pad.Pkcs7
        });
        return encrypted;
    }

    function decodeAesString(encrypted,key,iv){
        var key  = CryptoJS.enc.Utf8.parse(key);
        var iv   = CryptoJS.enc.Utf8.parse(iv);
        var decrypted =CryptoJS.AES.decrypt(encrypted,key,{
            iv:iv,
            mode:CryptoJS.mode.CBC,
            padding:CryptoJS.pad.Pkcs7
        });
        return decrypted.toString(CryptoJS.enc.Utf8);
    }

    // 测试加、解密
    function testAES(){
        var data = "明文 123 abc1"; // 明文
        var key  = 'abcdef0123456789';  // 密钥 长度16
        var iv   = 'abcdef0123456789';  // 密钥 长度16

        console.log("加密前:" + data);

        // 测试加密
        var encrypted = encodeAesString(data,key,iv); // 密文
        console.log("加密后: " + encrypted);

        var decryptedStr = decodeAesString(encrypted,key,iv);
        console.log("解密后: " + decryptedStr);
    }
    testAES();
</script>

一些 JavaScript JS 函数

JS 模拟 POST 提交 (submit) 表单

function postcall( url, params, target){
	var tempform = document.createElement("form");
	tempform.action = url;
	tempform.method = "post";
	tempform.style.display="none"
	if(target) {
		tempform.target = target;
	}
	for (var x in params) {
		var opt = document.createElement("input");
		opt.name = x;
		opt.value = params[x];
		tempform.appendChild(opt);
	}
	var opt = document.createElement("input");
	opt.type = "submit";
	tempform.appendChild(opt);
	document.body.appendChild(tempform);
	tempform.submit();
	document.body.removeChild(tempform);
}

数组过滤重复值

//数组过滤重复值
function uniqueArr(array) {
  var n = []; //结果数组
  //从第一项开始遍历
  for (var i = 0; i < array.length; i++) {
	//如果当前数组的第i项在当前数组中第一次出现的位置不是i,
	//那么表示第i项是重复的,忽略掉。否则存入结果数组
	if (array.indexOf(array[i]) == i) n.push(array[i]);
  }
  return n;
}

删除空字符换行,过滤表格 text 中多余的空格

function Trim(str,is_global){
  var result;
  result = str.replace(/(^\s+)|(\s+$)/g,"");
  if(is_global && is_global.toLowerCase()=="g"){
	result = result.replace(/\s/g,"");
  }
  return result;
}

JS 中空的判断

alert(0 == ''); //true
alert(0 == false); //true
alert(false == ''); //true
alert(null == undefined); //true

alert(!0); //true
alert(!false); //true
alert(!undefined); //true
alert(!null); //true
alert(!''); //true

alert(0 == undefined); //false
alert(0 == null); //false
alert(false == null); //false
alert(false == undefined);//false
alert('' == null); //false
alert('' == undefined); //false

typeof(undefined) == 'undefined'
typeof(null) == 'object'
typeof("") == 'string'
typeof(0) == 'number'
typeof(false) == 'boolean'

String(undefined) -> "undefined"
String(null) -> "null"
String("") -> ""
String(0) -> "0"
String(false) -> "false"

区分 JS 中的 undefined , null , “” , 0 和 false

https://www.cnblogs.com/yangzhx/p/4019073.html

JS 移除 数组中指定元素

//首先需要找到元素的下标:
var array = [2, 5, 9];
var index = array.indexOf(5);
//使用splice函数进行移除:
if (index > -1) {
    array.splice(index, 1);
}
//splice函数的第二个参数指删除的数目。splice直接修改原数组,并把删除的所有元素以另一个新数组的方式返回。

数字前补零

function PrefixInteger(num, length) {
  return (Array(length).join('0') + num).slice(-length);
}

Toast 弹窗

function Toast(msg,duration){
  duration=isNaN(duration)?3000:duration;
  var m = document.createElement('div');
  m.innerHTML = msg;
  m.style.cssText="width: 60%;min-width: 150px;opacity: 0.7;height: 30px;color: rgb(255, 255, 255);line-height: 30px;text-align: center;border-radius: 5px;position: fixed;top: 40%;left: 20%;z-index: 999999;background: rgb(0, 0, 0);font-size: 12px;";
  document.body.appendChild(m);
  setTimeout(function() {
    var d = 0.5;
    m.style.webkitTransition = '-webkit-transform ' + d + 's ease-in, opacity ' + d + 's ease-in';
    m.style.opacity = '0';
    setTimeout(function() { document.body.removeChild(m) }, d * 1000);
  }, duration);
}

复制文本

//复制文本
function copy (id, attr='innerHTML') {
  let target = null;
  if (attr) {
    target = document.createElement('div');
    target.id = 'tempTarget';
    target.style.opacity = '0';
    if (id) {
      let curNode = document.querySelector('#' + id);
      target.innerText = curNode[attr];
    } else {
      target.innerText = attr;
    }
    document.body.appendChild(target);
  } else {
    target = document.querySelector('#' + id);
  }
  try {
    let range = document.createRange();
    range.selectNode(target);
    window.getSelection().removeAllRanges();
    window.getSelection().addRange(range);
    document.execCommand('copy');
    window.getSelection().removeAllRanges();
    console.log('复制成功:' + range)
  } catch (e) {
    console.log('复制失败')
  }
  if (attr) {
    // remove temp target
    target.parentElement.removeChild(target);
  }
}

获得链接地址的参数

function getQueryString(name,link=''){
  console.log(link)
  var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
  if(link){
    var num=link.indexOf("?");
    link=link.substr(num+1);
    var r = link.match(reg);
  }else{
    var r = window.location.search.substr(1).match(reg);
  }
  if(r!=null)return  unescape(r[2]); return null;
}

HTML 标签获取 图片地址

img_src: function (str){
  var imgReg = /<img.*?(?:>|\/>)/gi;
  var srcReg = /src=[\'\"]?([^\'\"]*)[\'\"]?/i;
  var arr = str.match(imgReg);    
  var list = []
  for(var i = 0; i < arr.length; i++) {
    var src = arr[i].match(srcReg);
    //获取图片地址
    if (src[1]) {
    list.push(src[1])
    }
    //当然你也可以替换src属性
    if (src[0]) {
      var t = src[0].replace(/src/i, "href");
    }
  }
  console.log(list)
  return list;
},

截取文件后缀

file_ext:function (name){
  let fileName = name.lastIndexOf(".");//取到文件名开始到最后一个点的长度
  let fileNameLength = name.length;//取到文件名长度
  let fileFormat = name.substring(fileName + 1, fileNameLength);//截
  console.log(fileFormat);
  return fileFormat
},

不刷新页面修改地址栏

var stateObject = {};
var title = "修改地址";
var newUrl = '/view/fontface4.html';
//修改地址栏中的地址,后退时返回当前页
history.pushState(stateObject, title, newUrl);
//修改地址栏中的地址,后退时返回前一页
history.replaceState(stateObject, title, newUrl);

jQuery Post 跳转

$.extend({
  StandardPost:function(url,args){
    console.log(args)
    var body = $(document.body),
      form = $("<form method='post'></form>"),
      input;
    form.attr({"action":url});
    $.each(args,function(key,value){
      input = $("<input type='hidden'>");
      input.attr({"name":key});
      input.val(value);
      form.append(input);
    });

    form.appendTo(document.body);
    form.submit();
    document.body.removeChild(form[0]);
  }
});
//使用
$.StandardPost(url,{data:'test'});

jQuery 模拟长按

$("#id").on({
  touchstart: function(e) {
    // 长按事件触发
    timeOutEvent = setTimeout(function() {
      timeOutEvent = 0;
      console.log("长按事件")
    }, 1000);
  },
  touchmove: function() {
    clearTimeout(timeOutEvent);
    timeOutEvent = 0;
  },
  touchend: function() {
    clearTimeout(timeOutEvent);
    timeOutEvent = 0;
    return false;
  }
})

指定日期的上个月,下个月

//下个月
const getNextMonth = function(date) {
  var arr = date.split('-');
  var year = arr[0]; //获取当前日期的年份
  var month = arr[1]; //获取当前日期的月份
  var day = arr[2]; //获取当前日期的日
  var days = new Date(year, month, 0);
  days = days.getDate(); //获取当前日期中的月的天数
  var year2 = year;
  var month2 = parseInt(month) + 1;
  if (month2 == 13) {
    year2 = parseInt(year2) + 1;
    month2 = 1;
  }
  var day2 = day;
  var days2 = new Date(year2, month2, 0);
  days2 = days2.getDate();
  if (day2 > days2) {
    day2 = days2;
  }
  if (month2 < 10) {
    month2 = '0' + month2;
  }

  var t2 = year2 + '-' + month2 + '-' + day2;
  return t2;
}
//上个月
const getPreMonth = function (date) {
  var arr = date.split('-');
  var year = arr[0]; //获取当前日期的年份
  var month = arr[1]; //获取当前日期的月份
  var day = arr[2]; //获取当前日期的日
  var days = new Date(year, month, 0);
  days = days.getDate(); //获取当前日期中月的天数
  var year2 = year;
  var month2 = parseInt(month) - 1;
  if (month2 == 0) {
    year2 = parseInt(year2) - 1;
    month2 = 12;
  }
  var day2 = day;
  var days2 = new Date(year2, month2, 0);
  days2 = days2.getDate();
  if (day2 > days2) {
    day2 = days2;
  }
  if (month2 < 10) {
    month2 = '0' + month2;
  }
  var t2 = year2 + '-' + month2 + '-' + day2;
  return t2;
}

HTML 锚点跳转平滑动画

    $('a[href*=#],area[href*=#]').click(function() {
        if (location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') && location.hostname == this.hostname) {
            var $target = $(this.hash);
            $target = $target.length && $target || $('[name=' + this.hash.slice(1) + ']');
            if ($target.length) {
                var targetOffset = $target.offset().top;
                $('html,body').animate({
                        scrollTop: targetOffset
                    },
                    200);
                return false;
            }
        }
    });

fSelect.js select 下拉多选框 checkbox 的使用方法

<!DOCTYPE html>
<html>
<head>
	<link href="jquery.fSelect.css" rel="stylesheet" type="text/css" />
	<script src="http://code.jquery.com/jquery-1.11.3.min.js"></script>
	<script src="jquery.fSelect.js"></script>
	<script>
		$(function() {
			$('.demo').fSelect();
		});
	</script>
</head>
<select class="demo" multiple="multiple">  
    <optgroup label="Languages">  
        <option value="cp">C++</option>  
        <option value="cs">C#</option>  
        <option value="oc">Object C</option>  
        <option value="c">C</option>  
    </optgroup>  
    <optgroup label="Scripts">  
        <option value="js">JavaScript</option>  
        <option value="php">PHP</option>  
        <option value="asp">ASP</option>  
        <option value="jsp">JSP</option>  
    </optgroup>  
</select>
</html>

JS 两个数组合并

//concat()把两个或者多个数组链接在一起,但是不改变已经存在的数组
//而是返回一个链接之后的新数组
var a = [1,2,3];
a.concat([4,5]);
console.log(a);
//此处输出为 [1, 2, 3]

var a = [1,2,3];
a = a.concat([4,5]);
console.log(a);
//此处输出为 [1, 2, 3 ,4 ,5]

Web 生成图片 html2canvas 示例

http://blog.liuguofeng.com/wp-content/uploads/2018/09/html2canvas.html

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>Using an existing canvas to draw on</title>
    <style>	
        button {
            clear: both;
            display: block;
        }
    </style>
</head>
<body>
<div><h1>这是HTML</h1>
	
    <div id="content" style="width:200px;height:200px;background: rgba(100, 255, 255, 0.5);">
	<img src='timg.jpg' style="width:100px;height:60px;">
	<span>这是文字</span>
	</div>
</div>
<h1>生成的图片</h1>
<canvas width="200" height="200"></canvas>
<script type="text/javascript" src="html2canvas.js"></script>
<button>点击生成图片</button>
<script type="text/javascript">
    var canvas = document.querySelector("canvas");
    document.querySelector("button").addEventListener("click", function() {
        html2canvas(document.querySelector("#content"), {canvas: canvas}).then(function(canvas) {
            console.log('Drew on the existing canvas');
        });
    }, false);
</script>
</body>
</html>

JavaScript 实现 Toast 吐司效果

JS

<script>
function Toast(msg,duration){
    duration=isNaN(duration)?3000:duration;
    var m = document.createElement('div');
    m.innerHTML = msg;
    m.style.cssText="width: 60%;min-width: 150px;opacity: 0.7;height: 30px;color: rgb(255, 255, 255);line-height: 30px;text-align: center;border-radius: 5px;position: fixed;top: 40%;left: 20%;z-index: 999999;background: rgb(0, 0, 0);font-size: 12px;";
    document.body.appendChild(m);
    setTimeout(function() {
        var d = 0.5;
        m.style.webkitTransition = '-webkit-transform ' + d + 's ease-in, opacity ' + d + 's ease-in';
        m.style.opacity = '0';
        setTimeout(function() { document.body.removeChild(m) }, d * 1000);
    }, duration);
}
</script>

HTML

<html>
	<head>
	<style>
	body {
		font-family: 'Lucida Grande', 'Helvetica', sans-serif;
	}
	</style>
	</head>
	<body>
	<button onclick="Toast('这是一个吐司',2000);">Toast</button>
	</body>
</html>