JavaScript 错误 : Uncaught TypeError: undefined is not a function on line 4; I Don't Know What I Did Wrong

Question

我试图让用户写一个句子，然后让计算机在单独的“确认窗口”中确认每个单词，而不使用空格。为了确定此代码是否是执行此任务的正确代码，我必须运行该代码，但是我收到第四行标题中列出的错误。首先，我不明白该错误在说什么。如果它告诉我第四行的 if 语句不是函数并且无法运行它，那是怎么回事？

<script>
function sentenceFinder (sentence){
    for (counter = 0; counter < sentence.length; counter++){
        if (sentence.substring(counter, counter + 1) !== " "){
            words.push(sentence.substring(counter, counter + 1));
        }
        else {
            comfirm(words[0]);
        }
     };
}

var x = prompt("Please type in the sentence that will be seperated.")
sentenceFinder(x)

var words = []
</script>

Answer 1

您有两个问题导致错误。

1. 您正在使用 subscript，我认为您打算使用 substring。
2. 在将其设置为数组之前，您正在使用 words。

我想这就是你想要写的。

function sentenceFinder (sentence){
    for (counter = 0; counter < sentence.length; counter++){
        if (sentence.substring(counter, counter + 1) !== " "){
            words.push(sentence.substring(counter, counter + 1));
        }
        else {
            comfirm(words[0]);
        }
     };
}

var words = [];
var x = prompt("Please type in the sentence that will be seperated.");
sentenceFinder(x);