自己封裝的深拷貝方法js

    // var newObj1 = oldObj;
    // newObj1.name = "王伏虎";
    // console.log(newObj1, "--", oldObj); // 拷贝的是地址，浅拷贝;

    // 手写深拷贝的方法
    function deepCopy(obj) {
      if (typeof obj !== "object" || obj == null)
        return obj;

      var target;

      if (obj instanceof Array)
        target = []
      else
        target = {}

      for (var i in obj) {
        if (obj.hasOwnProperty(i)) {
          target[i] = deepCopy(obj[i])
        }
      }
      return target;
    }

    var oldObj = {
      "name": "王降龙",
      "age": 18,
      "title": "降龙十八掌",
      class: [{ aa: 111 }],
      other: {
        girlFriend: null
      }
    }


    var newObj2 = deepCopy(oldObj);
    newObj2.name = ‘王伏虎‘;
    console.log(newObj2, "--", oldObj); // 拷贝的是内存的值，深拷贝;

    function newCart(name) {
      this.name = name;
    }

    newCart.prototype = {
      lunzi: 4,
      yushua: 1,
      qiyou: true,
    }

    var dazhong = new newCart(‘dazhong‘);
    var baoma = new newCart(‘baoma‘);
    // baoma.__proto__.lunzi = 5;
    // // dazhong.__proto__ = baoma.__proto__;
    // dazhong.__proto__ = deepCopy(baoma.__proto__); // 不進行深拷貝就是5
    // console.log(dazhong.lunzi); //这样就是4啦  
    // console.dir(dazhong)