JS 对象深度拷贝方法 js对象赋值问题(对象赋值影响原对象、对象赋值后原对象值随之变化)
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解决方法(转换类型法): JSON.parse(JSON.stringify(obj))
解决方法(es6之Object.assign()法):obj2=Object.assign({},obj1)
终极解决方案:
// 对象深度拷贝方法 function deepCopy(obj) { let copy; // Handle the 3 simple types, and null or undefined if (null == obj || "object" != typeof obj) return obj; // Handle Array if (obj instanceof Array) { copy = []; for (let i = 0, len = obj.length; i < len; i++) { copy[i] = deepCopy(obj[i]); } return copy; } // Handle Object if (obj instanceof Object) { copy = {}; for (let attr in obj) { if (obj.hasOwnProperty(attr)) copy[attr] = deepCopy(obj[attr]); } return copy; } } let a = { xiaoming: { yuwen: 89, shuxue: 99, yingyu: 100 }, xiaoma: [ 'a','b','c' ] }; let b = a; let c = Object.assign({}, a); let d = deepCopy(a); console.log('@',a,b,c,d); a.xiaoming.yuwen = 100; console.log('#',a,b,c,d);