document.all和document.forms [0]之间的区别 [英] difference between document.all and document.forms[0]

问题描述

任何人都可以解释

document.all

和
document.forms [0] 请？

谢谢

推荐答案

document.all 为您提供对类似于数组的对象的引用，该对象包含Internet Explorer （IE）中文档的所有元素。 Document.forms [0] 为您提供指向文档中第一个表单元素的指针，所有浏览器中的

document.all gives you a reference to an array-like object containing all elements of the document in Internet Explorer (IE). Document.forms[0] gives you a pointer to the first form element in the document, in all browsers

2则完全不同。如果你的表单有一个name属性，比如'myform'，那么在IE中，那个表单可以用 document.all.myform

The 2 are quite different then. If your form had a name attribute, say 'myform', then in IE that form could be referenced with document.all.myform

document.all 。你仍然可以使用它，即使在IE9中它仍然可用。通常它用于测试浏览器是否为IE：

document.all is deprecated from IE version 5 and up. You can still use it though, even in IE9 it's still available. Often it's used to test if the browser is IE:

if (document.all) {
  //o no, it's IE again! We have to do it another way!
}

以形式引用表格document.forms [ 0] 被认为是不好的做法。有关详细信息，请访问此处

Referencing forms in the form of document.forms[0] is considered bad practice. More on that can be found here

注意：由于这个答案是第一次写的，IE11已经被引入，它不再支持document.all 有关详细信息，请参阅IE11中的兼容性更改

NOTE: Since this answer was first written IE11 has been introduced which dropped support for document.all See Compatibility changes in IE11 for more information

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