SOURCE

//定义对象
var a = {type:"Fiat", model:500, color:"white"}

//访问对象
console.log(a.type)
console.log(a['model'])

//修改内容
a.type = 123
console.log(a.type)

//添加内容
a["news"] = 456
console.log(a.news)

//删除
delete a['news']
console.log(a)