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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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