start vue1:第一学习vue 源码

初学vue的心得体会1,es5与es6的语法区别变量,var let let / var let变量常量常量标识符//监听按钮的点击var btns = document.getElementsByTagName(“ button”); for(var i = 0; i <btns.length; i ++){(function(i){btns [i] .onclick = function(){alert(''+ i +'')}})(i)} 让btns = document.getElementsByTagName(“ button”); for(让i = 0; i <btns