Question

我有带有“ this”的代码，如果没有“ this”，如何编写相同的代码？

var memory_array = ["red", "red", "green", "green", "blue", "blue", "brown", "brown", "yellow", "yellow", "gray", "gray", "white", "white","black","black"];
var memory_values = [];
var memory_tile_ids = [];
var tiles_flipped = 0;
Array.prototype.memory_tile_shuffle = function(){
    var i = this.length, j, temp;
    while(--i > 0){
        j = Math.floor(Math.random() * (i+1));
        temp = this[j];
        this[j] = this[i];
        this[i] = temp;
    }
}

Answer 1

一种实现方法是将数组作为参数传递给函数，然后仅使用数组对其进行处理。

function memory_tile_shuffle(array){
    // You can also use a third argument array in forEach if you prefer
    array.forEach(function(item, i) {
        var j = Math.floor(Math.random() * (i+1));
        temp = array[j];
        array[j] = array[i];
        array[i] = temp;
    });
}

如何在JavaScript中替换它

1 个答案: