模板解析DEMO

let render = function (str, data) {  let tpl = str.replace(/<%=([\s\S]+?)%>/g,function (match, code) {      return "‘ +obj."+code+"+ ‘";  }) ;

tpl = "var tpl=‘"+tpl+"‘\n return tpl;";  let complied = new Function(‘obj‘,tpl);  return complied(data);};

let tpl = "Hello <%=username%>.";console.log(render(tpl,{username:"dana"}));

//上面这种做法每次都要编译执行。可以简化，使得编译一次，多次执行。//具体做法就是生成一个函数，然后返回，吧参数当做参数传递

let compile = function (str) {    let tpl = str.replace(/<%=([\s\S]+?)%>/g,function (match, code) {        return "‘ +obj."+code+"+‘";    });

tpl = "var tpl = ‘"+tpl+"‘\nreturn tpl";    return new Function(‘obj,escape‘,tpl);};let render1  = function (compile, data) {    return compile(data);};

let res = render1(compile,"Hello <%=username%>.");console.log(res({username:"dana1"}));