为什么我不能命名一个JavaScript函数“all”?

all is not a built-in function or keyword, but why can I not call a function if it is named all?

all不是内置函数或关键字，但如果它被命名为all，为什么我不能调用函数呢?

There is no error message in the debug console, and the function works if I rename it to all2.

在调试控制台中没有错误消息，如果我将它重命名为all2，那么这个函数就可以工作。

Here is the code: tested in chrome and IE10

代码如下:在chrome和IE10中测试过

<!DOCTYPE html>
    <head>
    </head>
    <body>
    <script>
        function all()
        {
            alert(1);
        }
        function all2()
        {
            alert(2);
        }
    </script>
    <input type="button" value="all1" onclick="all()">
    <input type="button" value="all2" onclick="all2()">
    </body>
</html>

1 个解决方案

#1

This should have worked in chrome. However all has been a method in IE until IE11.

这在chrome上应该行得通。然而，在IE11之前，所有这些都是IE中的一种方法。

[all is no longer supported. Starting with Internet Explorer 11, use getElementById. For info, see Compatibility changes.] Returns a reference to the collection of elements contained by the object. via http://msdn.microsoft.com/en-us/library/ie/ms537434(v=vs.85).aspx

不再支持所有内容。从Internet Explorer 11开始，使用getElementById。有关信息，请参见兼容性更改。返回对对象包含的元素集合的引用。通过http://msdn.microsoft.com/en-us/library/ie/ms537434(v = vs.85). aspx

I remember using it long ago, early javascript days something like this..

我记得很久以前用过它，早期的javascript就是这样。

for(i = 0; i < document.all.length; i++){
   document.all(i)   ...
}

It is deprecated in IE now and not implemented in most other browsers, although may still be considered a reserved name because of how wide reaching legacy code may be.

它在IE中被弃用，在大多数其他浏览器中都没有实现，尽管可能仍然被认为是一个保留的名称，因为它可能会有多广泛的遗留代码。

Update: I was able to track down another SO question, they answered it nicely.

更新:我找到了另一个SO问题，他们回答得很好。

document.all is available only on Internet Explorer, webkit and Opera.

文档。所有这些只能在Internet Explorer、webkit和Opera上使用。

On every other browser all is an undefined property of document object (and undefined is considered as a false value)

在所有其他浏览器上，所有文档对象都是未定义的属性(未定义的值被认为是一个假值)

As historical note: many (really many) years ago document.all was used to tell Internet Explorer from Netscape Navigator so if you meet a script that is checking if (document.all) ... I strongly suggest to find a better script :)

作为历史记录:许多(实际上许多)年前的文件。它们都是用来告诉Internet Explorer和Netscape Navigator的，所以如果你遇到一个正在检查if (document.all)的脚本……我强烈建议找一个更好的剧本:)

-Fabrizio Calderan

法布里奇奥Calderan

#1