如何使用JavaScript删除CSS属性？

In this article, we'll see how we can remove a CSS property from a certain element using JavaScript? We can remove only those properties that we assign ourselves and the pre-default ones cannot be removed by this method.

在本文中，我们将看到如何使用JavaScript从某个元素中删除CSS属性？ 我们只能删除分配给我们的属性，而默认属性不能被此方法删除。

HTML:

HTML：

<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Removing CSS property</title>
<!-- Compiled and minified CSS -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/css/materialize.min.css">
<!-- Compiled and minified JavaScript -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0/js/materialize.min.js"></script>
</head>
<style>
body {
background: silver;
}
h2 {
background: wheat;
padding: 10px;
}
.btn {
background: tomato;
}
.text {
font-weight: 500;
}
</style>
<body>
<div class="container">
<h2>Let's remove some css!</h2>
<div class="container">
<button class="btn">Just a random button!</button>
<p class="text">Lorem ipsum, dolor sit amet consectetur adipisicing elit. Tempora quis asperiores dicta quos laborum laboriosam perferendis ab veniam odit saepe, obcaecati officiis iure iste voluptates at quod commodi cupiditate voluptas!</p>
</div>
</div>
</body>
<script>
</script>
</html>

Output

输出量

remove CSS property using JavaScript (1)

We can call on a certain DOM selector's style property and use the remove property method to remove that particular CSS property. First, let's get a reference to all the DOM elements.

我们可以调用某个DOM选择器的style属性，并使用remove属性方法删除该特定CSS属性。首先，让我们参考所有DOM元素。

<script>
const heading = document.querySelector('h2');
const button = document.querySelector('.btn');
const para = document.querySelector('.text');
</script>

Now let's try to remove the background property from our heading,

现在，让我们尝试从标题中删除background属性，

heading.style.removeProperty("background");

Oops! That didn't quite work, did it? There's a simple explanation. We are loading our scripts when our whole page loads and the styles are written inside our stylesheet. Even if we remove a certain property using JavaScript, it wouldn't make any difference since that DOM element is also hooked to a stylesheet and we aren't removing any kind of CSS that we have written. Let's refactor our code a little bit now, let's clear out styles and apply those styles using JavaScript,

糟糕！那不是很有效，对吗？有一个简单的解释。当整个页面加载并且样式写在样式表中时，我们正在加载脚本。即使我们使用JavaScript删除某个属性，也不会有任何区别，因为该DOM元素也被挂钩到样式表，并且我们也不会删除我们编写的任何CSS。现在，让我们重构一下代码，清除样式并使用JavaScript应用这些样式，

<style>
/* body{
background: silver;
}
h2{
background: wheat;
padding: 10px;
}
.btn{
background: tomato;
}
.text{
font-weight: 500;
} */
</style>

Output

输出量

remove CSS property using JavaScript (2)

As you can see now all our styles are removed. Let's add them back in our JavaScript,

如您所见，我们的所有样式均已删除。让我们将它们重新添加到JavaScript中，

<script>
const heading = document.querySelector('h2');
const button = document.querySelector('.btn');
const para = document.querySelector('.text');
heading.style.background = "wheat";
heading.style.padding = "10px";
document.querySelector('body').style.background = "silver";
button.style.background = "tomato";
para.style.fontWeight = "500";
</script>

Output

输出量

remove CSS property using JavaScript (3)

And we have our styles back! Great. Now let's try removing them using our JavaScript,

我们的风格又回来了！大。现在，让我们尝试使用我们JavaScript删除它们，

heading.style.removeProperty("background");

Output

输出量

remove CSS property using JavaScript (4)

Our heading no longer has a wheat background! Great. Let's remove all the CSS properties inside a function and see if we get back the same unstyled page.

我们的标题不再具有小麦背景！大。让我们删除函数内的所有CSS属性，看看是否返回相同的未样式化页面。

function removeProperties() {
document.querySelector('body').style.removeProperty("background");
heading.style.removeProperty("background");
heading.style.removeProperty("padding");
button.style.removeProperty("background");
para.style.removeProperty("fontWeight");
}

Output

输出量