HTMLCollection.length
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
HTMLCollection.length 属性返回 HTMLCollection 中的元素数量。
值
一个正整数，表示 HTMLCollection 中元素的数量。
示例
length 属性在 DOM 编程中通常很有用。它通常用于测试集合的长度，去看它是否真的存在。它也通常用于 for 循环中的迭代器，如下示例。
js
// All the elements with the class ".test" in the document
var items = document.getElementsByClassName("test");
// For each test item in the list,
// append the entire element as a string of HTML
var gross = "";
for (var i = 0; i < items.length; i++) {
gross += items[i].innerHTML;
}
// gross is now all the HTML for the test elements
规范
| Specification |
|---|
| DOM # ref-for-dom-htmlcollection-length① |
浏览器兼容性
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