我正在尝试使用以下Javascript代码通过elementName访问每个节点：
function myFunction() {
var h1 = document.getElementsByName("demoNode");
for (var i = 0; i < h1.length; i++) {
if (h1[i].name == "demoNode") {
var att = h1[i].createAttribute("class");
att.value = "democlass";
h1[i].setAttributeNode(att);
}
}
}.democlass {
color: red;
}<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<p>Click the button to create a "class" attribute with the value "democlass" and insert it to the H1 element above.</p>
<button onclick="myFunction()">Try it</button>该代码应将标题文本着色为红色。但这似乎对我不起作用。你能让我知道为什么吗？这是jsfiddle的演示链接
h1[i].getAttribute("name")h1[i].setAttribute("class","democlass")另外，您不需要if条件，因为要获取的元素已经在使用name了。
function myFunction() {
var h1 = document.getElementsByName("demoNode");
for (var i = 0; i < h1.length; i++) {
h1[i].setAttribute("class", "democlass");
}
}.democlass {
color: red;
}<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<h1 name="demoNode">Hello World</h1>
<p>Click the button to create a "class" attribute with the value "democlass" and insert it to the H1 element above.</p>
<button onclick="myFunction()">Try it</button>本文收集自互联网，转载请注明来源。
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我来说两句