我有一个 html 页面，其中有几个 <div>和<p>我会给他们每个人分配一个渐进的数字标识符。我希望用 JavaScript 来完成此操作。
我是这样做的，但不知道是否正确。有更好的方法吗？谢谢
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script>
var id = -1;
function createId() {
return id++;
}
</script>
</head>
<body>
<div id = "createId();">
createId();
<h1 id = "createId();">CHAPTER I</h1>
<h2 id = "createId();">Down the Rabbit-Hole</h2>
<div id = "createId();"></div>
<p id = "createId();"><strong>Alice</strong> was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it,<i> 'and what is the use of a book,'</i> thought Alice<i> 'without pictures or conversations?’.</i></p>
<p id = "createId();">So she was considering in her own mind (as well as she could, for the hot day made her feel very sleepy and stupid), whether the pleasure of making a daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly a <strong>White Rabbit</strong> with pink eyes ran close by her.
There was nothing so very remarkable in that; nor did Alice think it so very much out of the way to hear the Rabbit say to itself, <i>'Oh dear! Oh dear! I shall be late!'</i> (when she thought it over afterwards, it occurred to her that she ought to have wondered at this, but at the time it all seemed quite natural). But when the <strong>Rabbit</strong> actually took a watch out of its waistcoat-pocket, and looked at it, and then hurried on, <strong>Alice</strong> started to her feet, for it flashed across her mind that she had never before seen a rabbit with either a waistcoat-pocket, or a watch to take out of it, and burning with curiosity, she ran across the field after it, and fortunately was just in time to see it pop down a large rabbit-hole under the hedge.</p>
</div>
</body>
最佳答案
嵌入 Javascript 是 HTML 通常是一个坏主意，尝试将它们分开。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script src="/js/your-script-file.js">/script>
</head>
<body>
<div>
<h1>CHAPTER I</h1>
<h2>Down the Rabbit-Hole</h2>
<div></div>
<p><strong>Alice</strong> was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it,<i> 'and what is the use of a book,'</i> thought Alice<i> 'without pictures or conversations?’.</i></p>
<p>So she was considering in her own mind (as well as she could, for the hot day made her feel very sleepy and stupid), whether the pleasure of making a daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly a <strong>White Rabbit</strong> with pink eyes ran close by her.
There was nothing so very remarkable in that; nor did Alice think it so very much out of the way to hear the Rabbit say to itself, <i>'Oh dear! Oh dear! I shall be late!'</i> (when she thought it over afterwards, it occurred to her that she ought to have wondered at this, but at the time it all seemed quite natural). But when the <strong>Rabbit</strong> actually took a watch out of its waistcoat-pocket, and looked at it, and then hurried on, <strong>Alice</strong> started to her feet, for it flashed across her mind that she had never before seen a rabbit with either a waistcoat-pocket, or a watch to take out of it, and burning with curiosity, she ran across the field after it, and fortunately was just in time to see it pop down a large rabbit-hole under the hedge.</p>
</div>
</body>
然后给每个节点添加一个id。
function addIds() {
var nodes = document.body.getElementsByTagName('*');
var id = 1;
for( var i = 0; i < nodes.length; i++ ) {
nodes[i].id = 'unique' + id++
}
}
addIds();
为什么要加上唯一的前缀？
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
关于javascript - 将渐进式 id 关联到 html 元素，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32633838/