Acquisition method: 1. Use the getElementById() method of document; 2. Use the getElementByClassName() method of document; 3. Use the getElementByName() method of document.
The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, Dell G3 computer.
JavaScript gets HTML elements
document’s getElementById() method
<body>
<a id="id">a标签</a>
<script>//document指当前文件，get即得到，Element即元素，ById即通过id；即通过id值获取当前文件中的元素
var element = document.getElementById("id");
console.log(element);
</script>
</body>Result:
document’s getElementByClassName() method:
<body>
<a class="first">a标签</a>
<a>a标签2</a>
<script>//ByClassName即通过Class值；即通过class值获取当前文件中的元素,因为可能不止一个，所以得到的为一个数组
var element = document.getElementsByClassName("first")[0];//此处只获取第一个
console.log(element);
var element2 = document.getElementsByTagName("a")[1];//此处只获取第二个
console.log(element2);
</script>
</body>Result:
Document’s getElementByName() method:
<body>
<form>
<input type="student" name="gender" id="1"><label for="1">男</label>
<input type="student" name="gender" id="2"><label for="2">女</label>
</form>
<script>//ByName即通过name值；即通过name值获取当前文件中的元素，因为可能不止一个，所以得到的为一个数组
var element = document.getElementsByName("gender");
console.log(element[0]);
console.log(element[1]);
</script>
</body>Result:
[Recommended learning: javascript advanced tutorial】
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