Question

我想创建一个非常简单的脚本来检查用户对预先存在的数组的输入。但是，它似乎不起作用，我不知道为什么。请记住，我是新手并尝试学习。

<script>
    var usernumber = prompt('What is your number?');
    var numbers = ['1', '2', '3'];
    if (usernumber == 'numbers') //If the user number matches one of preset numbers
    {
        alert('Match');
    } else {
        alert('No match found.');
    }
</script>

Answer 1

您可以在此处使用Array.indexOf原型函数：

if(numbers.indexOf(usernumber) >= 0){
    alert('Match');
}

参考：https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf

Answer 2

这对你来说很好用

<script>
    var usernumber = prompt('What is your number?');
    var numbers = ['1', '2', '3'];
    for(i=0;i<=numbers.length;i++)    
     {if (usernumber == numbers[i]) 

    {
        alert('Match');
         break;
    } }
     if(i==numbers.length) {
        alert('No match found.');
    }
</script>

Answer 3

您可以查看以下代码

    var usernumber = prompt('What is your number?');
    var numbers = ['1', '2', '3'];
    if (numbers.indexOf(usernumber) >=0 ) //If the user number matches one of preset numbers
    {
        alert('Match');
    } else {
        alert('No match found.');
    }

Answer 4

array.indexof（item）如果数组上不存在该项则返回-1，否则返回项目的索引

<script>
    var usernumber = prompt('What is your number?');
    var numbers = ['1', '2', '3'];
    if (numbers.indexOf(usernumber) >=0 ) // check if the item exists on the array
    {
        alert('Match');
    } else {
        alert('No match found.');
    }
</script>

Answer 5

 <script>
    var usernumber = prompt('What is your number?');
    var numbers = new Array();
    numbers['1'] = true;
    numbers['2'] = true;
    numbers['3'] = true;
    if (numbers[usernumber]) //If the user number matches one of preset numbers
    {
        alert('Match');
    } else {
        alert('No match found.');
    }
</script>

如何将用户输入与数组内的值进行比较？

5 个答案: