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数组下标问题

相关代码

    
    var arr = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"]
    console.log(Math.floor(Math.random() * 17));
    // console.log(typeof (Math.floor(Math.random() * 17)));
    console.log(arr[Math.floor(Math.random() * 17)]);

以0至16随机数作为下标 找不到对应的数组中的数据
例如image.png

下标为Math.floor(Math.random() * 17) //16
但arr[Math.floor(Math.random() * 17)] 却为7而不是f
这是为什么呢?


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1 Answer

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by (71.8m points)
let index = Math.floor(Math.random() * 17)

用个变量保存起来吧,不然每次随机数出来的值都不一样


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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