详解JS数据类型的值拷贝函数（深拷贝）

function mottoClone (obj) { if (obj === null || typeof obj !== 'object') return obj; if (obj instanceof Boolean) return new Boolean(obj.valueOf()); if (obj instanceof Number) return new Number(obj.valueOf()); if (obj instanceof String) return new String(obj.valueOf()); if (obj instanceof RegExp) return new RegExp(obj.valueOf()); if (obj instanceof Date) return new Date(obj.valueOf()); var cpObj = obj instanceof Array ? [] : {}; for (var key in obj) cpObj[key] = myClone(obj[key]); return cpObj;}

var obj = { id: 1, name: 'xxx', sayName: function () {  console.log('my name is' + this.name); }, childs: [  {},   {},   ... ], opts: {  xxx: [],  ... }, ...};var newObj = mottoClone(obj);