nodejs模板引擎

function render(str, data) {
    var tpl = str.replace(/<%=([\s\S]+?)%>/g, function (match, code) {
        if (match) {
            return "'+obj." + code + "+'";
        }
    });
    console.log(tpl);
    tpl = "var tpl='" + tpl + "'\nreturn tpl";
    console.log(tpl);
    var complied = new Function('obj', tpl);
    return complied(data);
}
console.log(render('hello <%=userName%>.', {userName: "li"}));

输出为：

hello '+obj.userName+'.
var tpl='hello '+obj.userName+'.'
return tpl
hello li.

tpl = "var tpl='" + tpl + "'\nreturn tpl";
function(obj){
    var tpl='hello '+obj.userName+'';
    return tpl;
}

用 Function 类直接创建函数的语法如下：

var function_name = new function(arg1, arg2, ..., argN, function_body)

function sayHi(sName, sMessage) {
  alert("Hello " + sName + sMessage);
}
//也可以定义为
var sayHi = new Function("sName", "sMessage", "alert(\"Hello \" + sName + sMessage);");

 

//利用预编译缓存模板编译后的结果，实际应用中就可以实现一次编译，多次执行
var compile = function (str) {
    var tpl = str.replace(/<%=([\s\S]+?)%>/g, function (match, code) {
        if (match) {
            return "'+obj." + code + "+'";
        }
    })
    tpl = "var tpl='" + tpl + "'\nreturn tpl";
    console.log(tpl);
    return new Function('obj', tpl);
}
var render = function (compiled, data) {
    return compiled(data);
}
var compiled = compile('hello <%=userName%> .');
console.log(render(compiled,{userName:'swa'}));