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  • 扩展运算符(Spread operator)

    扩展运算符(Spread operator)

    let zzz=[2,4,6];
    console.log(zzz);//[2, 4, 6]
    console.log(...zzz);//2 4 6
    

    展开并合并

    let a=[1,2,3];
    let b=[...a,4,5,6];
    console.log(b);//1,2,3,4,5,6
    
    let da=[1,2];
    let db=Array.from(da);
    db.push(3);
    console.log(da,db);//[1, 2]   [1, 2, 3]
    

    concat的连接数组

    var arr5= [3,4,5]
        var arr6 = [6,7,8]
        var arr7 = arr5.concat(arr6);
        console.log(arr7);//3,4,5,6,7,8
        var arr8 = [...arr5,...arr6];
        console.log(arr8);//3,4,5,6,7,8
    

    将字符串转化成数组

    var str = 'html';
    var arr9 = [...str];
    console.log(arr9);//["h", "t", "m", "l"]
    

    应用在解构赋值里

    let [a,b,...c]=[1,2,3,4,5];
    console.log(a,b);//1 2
    console.log(c);//[3, 4, 5]
    
    var aa=[1,2,3];
    var bb=[...aa];
    bb.push(4,5);
    console.log(bb);//[1, 2, 3, 4, 5]
    

    函数调用

    function aa(a,b){
            return a+b
    }
    let cc=[1,3]
    let bb=aa(...cc)
    console.log(bb);//4
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  • 原文地址:https://www.cnblogs.com/WWWrs/p/7156783.html
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