方法一：
JSON.parse(JSON.stringify(obj))
缺点：不能复制对象里的function，symbol，undefined
var obj = {
_name: "小明",
_age:18,
skill: function() {
console.log('1');
},
play: function() {
console.log('2')
},
a: undefined
}
var copyObj = JSON.parse(JSON.stringify(obj));
console.log(copyObj);//{_name: "小明", _age: 18}
copyObj.skill();//copyObj.skill is not a function
方法二：递归
var obj = {
_name: "小明",
_age:18,
skill: function() {
console.log('1');
},
play: function() {
console.log('2')
},
a: undefined
}
function deepCopy(obj){
let copyObj = Array.isArray(obj)?[]:{};
for(var key in obj){
copyObj[key] = typeof(obj[key])==="object"?deepCopy(obj[key]):obj[key];
}
console.log(copyObj==obj);//false
return copyObj;
}
console.log(deepCopy(obj));//{_name: "小明", skill: ƒ, play: ƒ, a: undefined}
