JavaScript 深浅拷贝

浅克隆

只能拷贝原始值，如果存在引用值，拷贝的是引用地址。origin 更改值后 target还是会被改变

function clone(origin, target) {
    var target = target || {};
    for (var prop in origin) {
        target[prop] = origin[prop];
    }
    return target;
}

var obj = {
    name: \'xiaoming\',
    age: 19
}
var obj1 = {};
clone(obj, obj1);

深度克隆

无论原始值还是引用值，都进行copy 互不影响

// 1. 遍历对象 for in
// 2. 判断是不是原始值 typeof
// 3. 判断是数组还是对象 toString
// 3. 建立相应的数组或对象
// 4. 递归

function deepClone(origin, target) {
    var target = target || {};
    for (var key in origin) {
        if (origin.hasOwnProperty(key)) {
            var res =  .prototype.toString.call(origin[key]);
            if (res === \'[   ]\') {
                target[key] = {};
                deepClone(origin[key], target[key]);
            } else if (res === \'[  Array]\') {
                target[key] = [];
                deepClone(origin[key], target[key]);
            } else {
                target[key] = origin[key];
            }
        }
    }
    return target;
}

var obj = {
    name: \'xiaoming\',
    age: 28,
    card: [\'visa\', \'master\'],
    wife: {
        name: \'xiaozhang\',
        son: {
            name: \'xiaoxiaoming\'
        }
    }
}

var obj1 = {};
deepClone(obj, obj1);