mixin(des, src)存在错误

[381510688]

var a = {
    "pt": {
        "common": {
            "a": 1,
            "c": 3
        }
    }
};
var b = {
    "pt": {
        "common": {
            "a": 2,
            "d": 3
        }
    }
}
console.log(mixin(a, b))

结果显示

[akira-cn]

默认复制des上不存在而src上存在的属性，会忽略掉des上已经存在的属性，要强制覆盖需要：

console.log(mixin(a, b, true));