我的CSS值不反映我的JavaScript中的值 [英] My CSS values does not reflect the values in my JavaScript
问题描述
我正在尝试读取显示值( display:none;
或 display:block;
)来自JavaScript的div(div id =navmenu)。但是当我在相同的html文件中设置样式值时,我能够阅读,但是当我在链接的CSS样式表中设置样式值时,它不会读取(结果只是空白)。
I'm trying to read display value (display:none;
or display:block;
) of a div (div id="navmenu") from JavaScript. But when I set the style values in same html file I'm able to read, but when I set the style values in the linked CSS style sheet it does not read (result is just blank).
<!DOCTYPE html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link href="styles.css" rel="stylesheet" type="text/css" media="screen" />
</head>
<body>
<div id="navmenu">
<p>This is a box of 250px * 250px</p>
</div><!--navmenu-->
<!------------------------------------------------------------------->
<script>
function display(elem) {
return elem.style.display;
}
alert(display(document.getElementById('navmenu')));
</script>
<!------------------------------------------------------------------->
</body>
</html>
和css
and css
#navmenu {
display:block;
width:250px;
height:250px;
background-color:#3CC;
}
推荐答案
elem.style.display
属性仅报告直接在DOM对象上设置的显示属性。它不会报告从样式表继承的样式。
The elem.style.display
property only reports a display property that is set directly on the DOM object. It does not report a style that is inherited from a style sheet.
要获取样式值,包括样式表中的样式值,可以使用 window.getComputedStyle()
To get a style value including those from a style sheet, you can use window.getComputedStyle()
.
function display(elem) {
return getComputedStyle(elem, null).getPropertyValue("display");
}
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