1. 可以让前端开发更简单，不需要为了生成一个dom结构而使用+运算符去拼接字符串，而只需要一个元素的（里面的html模板），或者一个变量（存储着模板），或者 一个模板文件
2. 易于维护，减少耦合，假使你的dom结构变化了，不需要更改逻辑代码，而只需要更改对应的模板（文件）
3. 可以缓存，如果你的模板是一个类似.tpl的文件，那么完全可以用浏览器去加载，并且还存下来 。说到.tpl文件，可以做的不仅仅是缓存了，你还可以做到通过模块加载器
4. 等等等
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>ice demo</title>
<script src="/javascripts/jquery/jquery-1.7.2.js"></script>
<script src="/javascripts/ice/ice.js"></script>
<body>
<div id="content"></div>
</body>
<script type="text/html" id="tpl">
<div>here is the render result:</div>
<% = this.title() ;%>
<table border=1>
<% for(var i=0,tl = this.trs.length,tr;i<tl;i++){ %>
<%
tr = this.trs[i];
if (tr.sex === "女") {
%>
<tr>
<td><%= tr.name;; %></td> <td><%= tr.age; %></td> <td><%= tr.sex || "男" %></td>
</tr>
<% } %>
<% } %>
</table>
<img src="<%= this.href %>">
<%= this.include(tpl2,this); %>
</script>
<script type="text/html" id="tpl2">
<div>here is the render result:</div>
<% = this.print(Welcome to Ice Template) ;%>
<table border=1>
<% for(var i=0,tl = this.trs.length,tr;i<tl;i++){ %>
<%
tr = this.trs[i];
if (tr.sex === "男") {
%>
<tr>
<td><%= tr.name;; %></td> <td><%= tr.age; %></td> <td><%= tr.sex || "男" %></td>
</tr>
<% } %>
<% } %>
</table>
<img src="<%= this.href %>">
</script>
<script>
var trs = [
{name:"隐形杀手",age:29,sex:"男"},
{name:"索拉",age:22,sex:"男"},
{name:"fesyo",age:23,sex:"女"},
{name:"恋妖壶",age:18,sex:"男"},
{name:"竜崎",age:25,sex:"男"},
{name:"你不懂的",age:30,sex:"女"}
]
// var html = ice("tpl",{
// trs: trs,
// href: "http://images.jb51.net/type4.jpg"
// },{
// title: function(){
// return "<p>这是使用视图helper输出的代码片断</p>"
// }
// });
var elem = document.getElementById(tpl);
var tpl = elem.innerHTML;
var html = ice(tpl,{
trs: trs,
href: "http://images.jb51.net/type4.jpg"
},{
title: function(){
return "<p>这是使用视图helper输出的代码片断</p>"
}
});
console.log(html);
$("#content").html(html);
</script>
</html>
(function (win) {
// 模板引擎路由函数
var ice = function (id, content) {
return ice[
typeof content === object ? render : compile
].apply(ice, arguments);
};
ice.version = 1.0.0;
// 模板配置
var iConfig = {
openTag : <%,
closeTag : %>
};
var isNewEngine = !!String.prototype.trim;
// 模板缓存
var iCache = ice.cache = {};
// 辅助函数
var iHelper = {
include : function (id, data) {
return iRender(id, data);
},
print : function (str) {
return str;
}
};
// 原型继承
var iExtend = Object.create || function (object) {
function Fn () {};
Fn.prototype = object;
return new Fn;
};
// 模板编译
var iCompile = ice.compile = function (id, tpl, options) {
var cache = null;
id && (cache = iCache[id]);
if (cache) {
return cache;
}
// [id | tpl]
if (typeof tpl !== string) {
var elem = document.getElementById(id);
options = tpl;
if (elem) {
// [id, options]
options = tpl;
tpl = elem.value || elem.innerHTML;
} else {
//[tpl, options]
tpl = id;
id = null;
}
}
options = options || {};
var render = iParse(tpl, options);
id && (iCache[id] = render);
return render;
};
// 模板渲染
var iRender = ice.render = function (id, data, options) {
return iCompile(id, options)(data);
};
var iForEach = Array.prototype.forEach ?
function(arr, fn) {
arr.forEach(fn)
} :
function(arr, fn) {
for (var i = 0; i < arr.length; i++) {
fn(arr[i], i, arr)
}
};
// 模板解析
var iParse = function (tpl, options) {
var html = [];
var js = [];
var openTag = options.openTag || iConfig[openTag];
var closeTag = options.closeTag || iConfig[closeTag];
// 根据浏览器采取不同的拼接字符串策略
var replaces = isNewEngine
?["var out=,line=1;", "out+=", ";", "out+=html[", "];", "this.result=out;"]
: ["var out=[],line=1;", "out.push(", ");", "out.push(html[", "]);", "this.result=out.join();"];
// 函数体
var body = replaces[0];
iForEach(tpl.split(openTag), function(val, i) {
if (!val) {
return;
}
var parts = val.split(closeTag);
var head = parts[0];
var foot = parts[1];
var len = parts.length;
// html
if (len === 1) {
body += replaces[3] + html.length + replaces[4];
html.push(head);
} else {
if (head ) {
// code
// 去除空格
head = head
.replace(/^\s+|\s+$/g, )
.replace(/[\n\r]+\s*/, )
// 输出语句
if (head.indexOf(=) === 0) {
head = head.substring(1).replace(/^[\s]+|[\s;]+$/g, );
body += replaces[1] + head + replaces[2];
} else {
body += head;
}
body += line+=1;;
js.push(head);
}
// html
if (foot) {
_foot = foot.replace(/^[\n\r]+\s*/g, );
if (!_foot) {
return;
}
body += replaces[3] + html.length + replaces[4];
html.push(foot);
}
}
});
body = "var Render=function(data){ice.mix(this, data);try{"
+ body
+ replaces[5]
+ "}catch(e){ice.log(rend error : , line, line);ice.log(invalid statement : , js[line-1]);throw e;}};"
+ "var proto=Render.prototype=iExtend(iHelper);"
+ "ice.mix(proto, options);"
+ "return function(data){return new Render(data).result;};";
var render = new Function(html, js, iExtend, iHelper, options, body);
return render(html, js, iExtend, iHelper, options);
};
ice.log = function () {
if (typeof console === undefined) {
return;
}
var args = Array.prototype.slice.call(arguments);
console.log.apply && console.log.apply(console, args);
};
// 合并对象
ice.mix = function (target, source) {
for (var key in source) {
if (source.hasOwnProperty(key)) {
target[key] = source[key];
}
}
};
// 注册函数
ice.on = function (name, fn) {
iHelper[name] = fn;
};
// 清除缓存
ice.clearCache = function () {
iCache = {};
};
// 更改配置
ice.set = function (name, value) {
iConfig[name] = value;
};
// 暴露接口
if (typeof module !== undefined && module.exports) {
module.exports = template;
} else {
win.ice = ice;
}
})(window);
