??? javascript6/ECMAScript2015 ????????????????javascript 5??2009??????????????????????????????
　　????????????????
1?????　　????????????????????????????
var param = 'b'; var str = 'a ' + param + ' c'; 　　ES6??????????????????
var str = `a ${param} c`; 　　?????????? “???? ”
2??????　　???????html??????????????????????????
var html = '<div>' + '<span>test</span>' + '</div>'; 　　???????????
　　ES6????????????
var html = `<div> <span>test</span> </div>`; 　　???????????????????
3??????　　??????????????????????
function (width, height) { var height = height || 300; var width = width || 600; ... } 　　ES6?????????
function (width=600, height=300) { ... }4?????　　?????json??
var data = {name:'dys', age:1}; 　　???name,age???????????
var name = data.name; var age = data.age; 　　ES6?????????
var {name, age} = data; 　　??????????????????????ES6?????????????????ES6??????????ES6?????ES5?????? babel?????????ES6?????????