Introduction to common methods of obtaining element instructions in js (with code)-JS Tutorial-php.cn

Introduction to common methods of obtaining element instructions in js (with code)

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Release： 2018-08-21 14:42:05

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This article brings you an introduction to the common methods of obtaining element instructions in js (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Obtain through the ID of the element: getElementById(); (for a single element)

(The following instructions often obtain an array, if To obtain one of the elements, the corresponding subscript should be added at the end)

Obtain through the class name of the element: getElementsByClassName();
Get through the tag name of the element: getElementsByTagName();
Get through the name of the element: getElementsByName();

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<span id="word">
			文字
		</span>
		<span class="words">
			文字
		</span>
		<span class="words">
			文字
		</span>
		<span class="words">
			文字
		</span>
		<input type="text" name="kuang" value="123" />
		<input type="text" name="kuang" value="456" />
		<input type="text" name="kuang" value="789" />
		
		<script type="text/javascript">
			var elements=document.getElementById("word");
			for (var i in elements) console.log(elements[i]);
			elements=document.getElementsByClassName("words");
			for (var i in elements) console.log(elements[i]);
			elements=document.getElementsByTagName("span");
			for (var i in elements) console.log(elements[i]);
			elements=document.getElementsByName("kuang");
			for (var i in elements) console.log(elements[i]);
			
                        element=document.getElementsByClassName("words")[0];
                        console.log(element);
		</script>
	</body>
</html>

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