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Two ways to change css style in native js

迷茫Original: 2017-03-26 16:58:471788browse

Below I will introduce to you two ways to change CSS styles in native js:

1Through the node in the javascript code. style.cssText="css expression 1; css expression 2; css expression 3 " directly changes the CSS style.

2First set the style for a specific class such as the "active class" in the CSS style sheet (the active class here is assumed and does not exist for the time being), and then in the javascript code Through node.classname="active", the style setting of the active class in the CSS style sheet is attached to the node node.

The following is a detailed introduction, first is the html code:

<style type="text/css">
           p {
			float: left;
			padding: 20px;
			margin: 10px;
			border: 1px solid #000;
			background-color: #fff;
			color: #000;
		}
           .active
                {
                       background-color:blue
                }
</style>
<body>
      <p class="root">
      </p>
</body>

is just a simple p, the running result is

First use the above The first way to change the css style is to write the following javascript code:

<script type="text/javascript">  
  var root=document.getElementsByClassName("root")[0];
  root.style.cssText="background-color: blue;color: #fff;";
</script>

The running result is:

Then use the second method mentioned above To change the css style, write the following javascript code:

<script type="text/javascript">  
    var root=document.getElementsByClassName("root")[0];
    root.className="active";
</script>

The same running result is:

Summary: The results of these two methods are the same, but As far as the operation process is concerned, the second method, which is the "node.classname" method, separates the writing of css and js, which is obviously more reasonable and orderly. If the css statement is relatively simple, there is no difference between the two methods, but if the css statement is relatively complex, obviously the second method is more methodical.

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