JavaScript错误-document.getElementsById不是函数 [英] Javascript error - document.getElementsById is not a function

问题描述

由于我在循环中调用此代码.但是下面的代码给了我错误，因为 document.getElementsById 不是一个函数.我该怎么办，如何才能循环调用doc.getbyid.

Since I am calling this code in loop. But following code is giving me error as document.getElementsById is not a function. What should I do how can I call doc.getbyid in loop.

for (var z=1; z < i; z++){
       var textbox = document.getElementsById("a"+z).value;
       var textbox2 = document.getElementsById("b").value;
       var textbox3 = document.getElementsById("c").value;
       alert(textbox);
       alert(textbox2);
       alert(textbox3);
}

推荐答案

这是因为它 getElementById (请注意，元素"上缺少"s").如果考虑一下，这是有道理的，因为 id 值在文档中必须是唯一的，因此只有一个匹配的元素"，而不是多个元素".

That's because it getElementById (note the lack of the "s" on "Element"). Which makes sense if you think about it, because id values have to be unique in a document, so there will be only one "element" that matches, rather than multiple "elements".

但是，有些方法会返回使用复数元素"的多个元素，例如 getElementsByTagName ，因此您可以将它们混在一起.

However, there are methods that return multiple elements which do use the plural "elements", such as getElementsByTagName, so you may just be mixing them up.

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