javascript ejs v4与v5

没有加入新功能，只是提高了性能。

v2:之前最快的版本。

<!doctype html>
<html>
    <head>
        <meta charset="utf-8"/>
        <meta content="IE=8" http-equiv="X-UA-Compatible"/>
        <meta name="keywords" content="javascript模板 by 司徒正美" />
        <meta name="description" content="javascript模板 by 司徒正美" />
        <title>javascript模板 by 司徒正美</title>
    </head>
    <body>
        <div id="TC">javascript模板ejs v2 by 司徒正美</div>

})();

v4:v3的去函数递归版本

<!doctype html>
<html>
    <head>
        <meta charset="utf-8"/>
        <meta content="IE=8" http-equiv="X-UA-Compatible"/>
        <meta name="keywords" content="javascript模板 by 司徒正美" />
        <meta name="description" content="javascript模板 by 司徒正美" />
        <title>javascript模板 by 司徒正美</title>
    </head>
    <body>
        <h1>javascript模板 by 司徒正美</h1>
        <div id="tmplTC">这是容器</div>
        <script id="tmpl" type="tmpl">
            <h2>{{=  name }}{{= name }}</h2>
            {{# 这是注释!!!!!!!!! }}
            <ul>
                {{ for(var i=0; i< uls.length; i++){ }}
                <li>{{=  uls[i] }}的名字是{{= name }}</li>
                {{  }  }}
            </ul>
            {{ var color = "color:red;" }}
            <p style="text-indent:2em;{{= color }} ">{{= address }}</p>

</script>
        <script>
            (function () {

if(!String.prototype.trim){
                    String.prototype.trim = function(str){
                        return this.replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
                    }
                }
                var dom = {
                    quote: function (str) {
                        str = str.replace(/[\x00-\x1f\\]/g, function (chr) {
                            var special = metaObject[chr];
                            return special ? special : '\\u' + ('0000' + chr.charCodeAt(0).toString(16)).slice(-4)
                        });
                        return '"' + str.replace(/"/g, '\\"') + '"';
                    }
                },
                metaObject = {
                    '\b': '\\b',
                    '\t': '\\t',
                    '\n': '\\n',
                    '\f': '\\f',
                    '\r': '\\r',
                    '\\': '\\\\'
                },
                startOfHTML = "\t__views.push(",
                endOfHTML = ");\n";
                (function(){
                    //http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
                    var s = ["XMLHttpRequest",
                        "ActiveXObject('Msxml2.XMLHTTP.6.0')",
                        "ActiveXObject('Msxml2.XMLHTTP.3.0')",
                        "ActiveXObject('Msxml2.XMLHTTP')",
                        "ActiveXObject('Microsoft.XMLHTTP')"];
                    if( eval("''+/*@cc_on"+" @_jscript_version@*/-0")*1 === 5.7 && location.protocol === "file:"){
                        s.shift();
                    }
                    for(var i = 0 ,el;el=s[i++];){
                        try{
                            if(eval("new "+el)){
                                dom.xhr = new Function( "return new "+el)
                                break;
                            }
                        }catch(e){}
                    }
                })();

dom.partial = function(url){
                    var xhr = dom.xhr();
                    xhr.open("GET",url,false);
                    xhr.setRequestHeader("If-Modified-Since","0");
                    xhr.send(null);
                    return xhr.responseText|| ""
                }

dom.ejs = function (obj) {
                    if(!arguments[1]){
                        obj.left = obj.left || "%>";
                        obj.right = obj.right || "<%";
                        obj.rLeft = new RegExp("\\s*"+obj.left+"\\s*");
                        obj.rRight = new RegExp("\\s*"+obj.right+"\\s*");
                    }
                    var buff = ["var __views = [];\n"],
                    self = arguments.callee,
                    key = obj.selector || obj.url,str;
                    if(obj.selector){
                        var el = document.getElementById(key);
                        if (!el) throw "找不到目标元素";
                        str = el.text;
                    }else{
                        str =  dom.partial(key);
                        if(!str) throw "目标文件不存在";
                    }
                    if(!self[key]){//缓存模板函数
                        var arr = str.trim().split(obj.rLeft),temp = [],segment,els,url,i = 0, n= arr.length;
                        while (i<n) {
                            segment = arr[i++];
                            els = segment.split(obj.rRight);
                            if(segment.indexOf(obj.right) !== -1){//这里不使用els.length === 2是为了避开IE的split bug
                                switch (els[0].charAt(0)) {
                                    case "#"://处理注释
                                        break;
                                    case "="://处理后台返回的变量（输出到页面的);
                                        temp.push(startOfHTML, els[0].substring(1), endOfHTML)
                                        break;
                                    case ":"://处理局部模板
                                        delete obj.selector;
                                        url = obj.url =  els[0].substring(1).trim();
                                        //缓存构筑函数的数组
                                        self[url] = self[url] || self(obj,true);
                                        temp = temp.concat( self[url]);
                                        break;
                                    default:
                                        temp.push(els[0], "\n");
                                };
                                els[1] &&  temp.push(startOfHTML, dom.quote.call(null,els[1]), endOfHTML);
                            }else{
                                temp.push(startOfHTML, dom.quote.call(null,els[0]), endOfHTML);
                            }
                        }
                        if(arguments[1]){
                            return (self[key] = temp);
                        }else{
                            buff = buff.concat(temp);
                            self[key] = new Function("json", "with(json){"+buff.join("") + '\t};return __views.join("");');
                        }
                    }
                    return self[key](obj.json || {});
                };
                window.dom = dom;
            })();
        </script>
        <script>

v5:新的算法

<!doctype html>
<html>
    <head>
        <meta charset="utf-8"/>
        <meta content="IE=8" http-equiv="X-UA-Compatible"/>
        <meta name="keywords" content="javascript模板 by 司徒正美" />
        <meta name="description" content="javascript模板 by 司徒正美" />
        <title>javascript模板 by 司徒正美</title>
    </head>
    <body>
        <h1>javascript模板 by 司徒正美</h1>
        <div id="tmplTC">这是容器</div>
        <script id="tmpl" type="tmpl">
            <h2>{{=  name }}{{= name }}</h2>
            {{# 这是注释!!!!!!!!! }}
            <ul>
                {{ for(var i=0; i< uls.length; i++){ }}
                <li>{{=  uls[i] }}的名字是{{= name }}</li>
                {{  }  }}
            </ul>
            {{ var color = "color:red;" }}
            <p style="text-indent:2em;{{= color }} ">{{= address }}</p>

</script>
        <script>
            (function () {

if(!String.prototype.trim){
                    String.prototype.trim = function(str){
                        return this.replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
                    }
                }
                var dom = {
                    quote: function (str) {
                        str = str.replace(/[\x00-\x1f\\]/g, function (chr) {
                            var special = metaObject[chr];
                            return special ? special : '\\u' + ('0000' + chr.charCodeAt(0).toString(16)).slice(-4)
                        });
                        return '"' + str.replace(/"/g, '\\"') + '"';
                    }
                },
                metaObject = {
                    '\b': '\\b',
                    '\t': '\\t',
                    '\n': '\\n',
                    '\f': '\\f',
                    '\r': '\\r',
                    '\\': '\\\\'
                },
                startOfHTML = "\t__views.push(",
                endOfHTML = ");\n";
                (function(){
                    //http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
                    var s = ["XMLHttpRequest",
                        "ActiveXObject('Msxml2.XMLHTTP.6.0')",
                        "ActiveXObject('Msxml2.XMLHTTP.3.0')",
                        "ActiveXObject('Msxml2.XMLHTTP')",
                        "ActiveXObject('Microsoft.XMLHTTP')"];
                    if( eval("''+/*@cc_on"+" @_jscript_version@*/-0")*1 === 5.7 && location.protocol === "file:"){
                        s.shift();
                    }
                    for(var i = 0 ,el;el=s[i++];){
                        try{
                            if(eval("new "+el)){
                                dom.xhr = new Function( "return new "+el)
                                break;
                            }
                        }catch(e){}
                    }
                })();

dom.partial = function(url){
                    var xhr = dom.xhr();
                    xhr.open("GET",url,false);
                    xhr.setRequestHeader("If-Modified-Since","0");
                    xhr.send(null);
                    return xhr.responseText|| ""
                }

dom.ejs = function (obj) {
                    if(!arguments[1]){
                        obj.left = obj.left || "%>";
                        obj.right = obj.right || "<%";
                        obj.reg = new RegExp('([\\s\\S]*?)(?:'+obj.left+')((.)([\\s\\S]*?))(?:'+obj.right+')','g');
                    }
                    var buff = ["var __views = [];\n"],
                    self = arguments.callee,
                    key = obj.selector || obj.url,str;
                    if(obj.selector){
                        var el = document.getElementById(key);
                        if (!el) throw "找不到目标元素";
                        str = el.text;
                    }else{
                        str =  dom.partial(key);
                        if(!str) throw "目标文件不存在";
                    }
                    if(!self[key]){//缓存模板函数
                        var temp = [];
                        str = str.replace(obj.reg,function($,outer,inner,symbol,logic){
                            outer && temp.push(startOfHTML, dom.quote.call(null,outer.trim()), endOfHTML);
                            switch (symbol) {
                                case "#"://处理注释
                                    break;
                                case "="://处理后台返回的变量（输出到页面的);
                                    temp.push(startOfHTML, logic, endOfHTML)
                                    break;
                                case ":"://处理局部模板
                                    delete obj.selector;
                                    var url = obj.url =  logic.trim();
                                    //缓存构筑函数的数组
                                    self[url] = self[url] || self(obj,true);
                                    temp = temp.concat( self[url] );
                                    break;
                                default:
                                    temp.push(inner, "\n");
                            }
                            return ""
                        });
                        str && temp.push(startOfHTML, dom.quote.call(null,str.trim()), endOfHTML);
                    }
                    if(arguments[1]){
                        return (self[key] = temp);
                    }else{
                        buff = buff.concat(temp);
                        self[key] = new Function("json", "with(json){"+buff.join("") + '\t};return __views.join("");');
                    }
                    return self[key](obj.json || {});
                };
                window.dom = dom;
            })();

</script>
        <script>

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原文地址：https://www.cnblogs.com/rubylouvre/p/1813122.html