摘要：索引對象深拷貝網(wǎng)絡圖片轉(zhuǎn)在線圖片點擊下載對象深拷貝對象深拷貝對象深拷貝對象深拷貝對象的深拷貝一級屬性拷貝和多級屬性嵌套拷貝深拷貝函數(shù)滿足屬性多級嵌套處理重復引用，防止死循環(huán)屬性為對象，遞歸深度復制測試對象的深拷貝大錘一級屬性深拷貝的函數(shù)特性

索引

1、對象深拷貝

2、網(wǎng)絡圖片轉(zhuǎn)base64, 在線圖片點擊下載

3、對象深拷貝

4、對象深拷貝

5、對象深拷貝

6、對象深拷貝

1、對象的深拷貝（一級屬性拷貝和多級屬性嵌套拷貝）

//深拷貝函數(shù)（滿足屬性多級嵌套）
function deepCloneObj(sourceObj){ var obj = (sourceObj instanceof Array) ? [] : {}; for (var key in sourceObj){ var tmp = sourceObj[key]; //處理重復引用，防止死循環(huán)
        if (tmp === sourceObj){ continue; 
        } if (typeof tmp === "object"){
            obj[key] = arguments.callee(tmp); //屬性為對象，遞歸深度復制
 } else{
            obj[key] = tmp;
        }
    } return obj;
} //

1、測試對象的深拷貝

var obj = {info:{name:"大錘"}, sign: "xxx"}; var obj2 = Object.assign({}, obj);  //一級屬性深拷貝 （es6的Object.assign函數(shù)特性）
var obj3 = {...obj};            //一級屬性深拷貝 (es6擴展運算符)
var obj4 =  deepCloneObj(obj);  //遞歸深拷貝所有層級屬性
var obj5 = JSON.parse(JSON.stringify(obj)); //深拷貝所有層級屬性
 console.log("obj: ", JSON.stringify(obj));
console.log("obj2: ", JSON.stringify(obj2));
console.log("obj3: ", JSON.stringify(obj3));
console.log("obj4: ", JSON.stringify(obj4));
console.log("obj5: ", JSON.stringify(obj5));
console.log(".........end..........");

setTimeout(function(){

    obj.sign = "a**b"; 
    obj.info.name = "一二三";
    console.log("
****update info ****");
    console.log("obj: ", JSON.stringify(obj));
    console.log("obj2: ", JSON.stringify(obj2));
    console.log("obj3: ", JSON.stringify(obj3));
    console.log("obj4: ", JSON.stringify(obj4));
    console.log("obj5: ", JSON.stringify(obj5));
    console.log(".........end..........");
},100); /* 打印日志結(jié)果：
obj:  {"info":{"name":"大錘"},"sign":"xxx"}
obj2:  {"info":{"name":"大錘"},"sign":"xxx"}
obj3:  {"info":{"name":"大錘"},"sign":"xxx"}
obj4:  {"info":{"name":"大錘"},"sign":"xxx"}
obj5:  {"info":{"name":"大錘"},"sign":"xxx"}
.........end..........

****update info ****
obj:  {"info":{"name":"一二三"},"sign":"a**b"}   //只拷貝了第一級屬性
obj2:  {"info":{"name":"一二三"},"sign":"xxx"}   //只拷貝了第一級屬性
obj3:  {"info":{"name":"一二三"},"sign":"xxx"}   //只拷貝了第一級屬性
obj4:  {"info":{"name":"大錘"},"sign":"xxx"}     //所有層級深拷貝
obj5:  {"info":{"name":"大錘"},"sign":"xxx"}    //所有層級深拷貝 */

//2、測試數(shù)組的深拷貝

setTimeout(function(){
    console.log("

.....數(shù)組的深拷貝測試...."); var arr = [{name: "小明"}, true, 18]; var arr2 = Object.assign([], arr); var arr3 = [...arr2]; var arr4 = deepCloneObj(arr); var arr5 = JSON.parse(JSON.stringify(arr));

    console.log("arr: ", JSON.stringify(arr));
    console.log("arr2: ", JSON.stringify(arr2));
    console.log("arr3: ", JSON.stringify(arr3));
    console.log("arr4: ", JSON.stringify(arr4));
    console.log("arr5: ", JSON.stringify(arr5));
    console.log("......end......
");

    setTimeout(function(){

        arr[0].name = "五六七", arr[1] = false, arr[2] = 99;
        console.log("arr: ", JSON.stringify(arr));
        console.log("arr2: ", JSON.stringify(arr2));
        console.log("arr3: ", JSON.stringify(arr3));
        console.log("arr4: ", JSON.stringify(arr4));
        console.log("arr5: ", JSON.stringify(arr5));

    }, 100); /* 數(shù)組測試打印日志結(jié)果：
    .....數(shù)組的深拷貝測試....
    arr:  [{"name":"小明"},true,18]
    arr2:  [{"name":"小明"},true,18]
    arr3:  [{"name":"小明"},true,18]
    arr4:  [{"name":"小明"},true,18]
    arr5:  [{"name":"小明"},true,18]
    ......end......

    arr:  [{"name":"五六七"},false,99]
    arr2:  [{"name":"五六七"},true,18]    //只拷貝了第一級屬性
    arr3:  [{"name":"五六七"},true,18]   //只拷貝了第一級屬性
    arr4:  [{"name":"小明"},true,18]    //所有層級深拷貝
    arr5:  [{"name":"小明"},true,18]   //所有層級深拷貝 */ },1000);