js - 常用功能方法汇总（updating...）

 1 /*
 2     * @Author: guojufeng@ 
 3     * @Date: 2018-10-30 20:07:06
 4     * @purpose 获取一个值的类型
 5     * @param {variateName} target: 要获取类型的变量名或对象
 6     * @output {string} result || "null": 返回的参数 - result或者null,为字符串形式的
 7     */
 8     function getType(target) {
 9       if(target === null){
10         console.log(target)
11         return "null";
12       }
13       let result = typeof (target);
14       if (result == "object") { 
15         if (target instanceof Array) {
16           result = "array";
17         } else if (target instanceof Object) {
18           result = "object";
19         }
20       }
21       console.log(result)
22       return result;//返回类型值的字符串形式
23     }

1 var nu= null;// null 怎么算
2 var un= undefined;
3 var c = new Array;
4 var d = {};
5 console.log(getType(c),getType(d),getType(nu),getType(un))

 1 /*
 2     * @Author: guojufeng@ 
 3     * @Date: 2018-10-30 20:48:44 
 4     * @purpose 深度克隆
 5     * @param {variateName} origin: 要克隆的对象变量名
 6     * @output {对应值} 根据origin的类型返回的具体值
 7 */
 8 function deepClone(origin) {
 9     let type = getType(origin),
10     target;
11     if (type == "array") {
12         target = [];
13         /* 数组 */
14         origin.forEach(el = >{
15             console.log("ele", el) target.push(deepClone(el));
16         });
17     } else if (type == "object") {
18         /* 对象 */
19         target = {};
20         for (const key in origin) {
21             if (origin.hasOwnProperty(key)) {
22                 /* 注意，只拷贝元素身上的，而不拷贝其原型上的值 */
23                 const el = origin[key];
24                 target[key] = deepClone(el);
25             }
26         }
27     } else if (type == "function") {
28         /* 函数 */
29         target = function() {};
30         target = origin;
31     } else {
32         /* 原始值 */
33         target = origin;
34     }
35     return target;
36 }

var test = [1, 2, null, undefined, false, [3, 4]];
var res = deepClone(test);
console.log(res, getType(res)) 
res.push(222);
console.log(res) 
console.log(test) 
var test1 = {
    a: 1,
    b: 2,
    c: [1, 2],
    d: function() {
        console.log(this.d)
    }
};
var res1 = deepClone(test1);
console.log(res1, getType(res1)) 
res1.b = 3;
res1.c.push('test');
console.log("res1修改值", res1);
console.log("test1原始值", test1);
res1.d = null;
console.log("res1修改值", res1);
console.log("test1原始值", test1);