9.7 swap(a,b)的第二种方法

    function swap(a, b){
        a = a + b ;
        b = a - b ;
        a = a - b ;
    }
    
    function (a, b){
        [a, b ] = [b , a ]
    }

    function swap(a, b){
        a = a + b ;
        b = a - b ;
        a = a - b ;
        console.log(a, b );
    }

    function swapa(a, b){
        [a, b ] = [b , a ];
        console.log(a, b );
    }

    var a = 1;
    var b = 2;
    swap(a, b);
    swapa(a, b);
    console.log(a, b );

需要注意的是，函数作用域里面的a,b改变了，但是全局的a,b没有改变

标签：function,console,log,swap,第二种,swapa,var,9.7
来源： https://blog.csdn.net/qq_44805237/article/details/108466127