深度克隆

function deepClone(target, origin){
    var target = target || {},
        toString = Object.prototype.toString,
        ArrStr = "[object Array]";
    for(var prop in origin){
        if(origin.hasOwnProperty(prop)){
            if(origin[prop] !== null && typeof(origin[prop]) === 'object'){
                target[prop] = toString.call(origin[prop]) === ArrStr ? [] : {};
                deepClone(target[prop], origin[prop]);
            }else{
                target[prop] = origin[prop];
            }
        }
    }
    return target;
}

我们来测试一下

var a = {
    a: 12,
    b: '123',
    c: {
        d: [1,2,3],
        f: function(){
            console.log("fun run");
        },
        g: [
            {
                name: 'a',
                age: 18
            }
        ]
    },
    k: null,
    m: undefined,
    l: true,
    j: function(){
        console.log("....j fun run");
    }
}
var b = {};

deepClone(b, a);

a.a = 10000;
b.a // 12 没有被改变