javascript：鼠标悬停为背景着色和不透明度

时间：2017-06-27 09:38:49

标签： javascript html css mousehover

从昨天起我开始使用javascript来制作适用于页面正文的悬停效果（我希望在悬停div时更改页面正文的背景颜色），

我已经看了一些教程并且我自己尝试了但是我最终失败了，我想知道如何用javascript创建这个效果，我使用了这样的东西。

＆＃13;
＆＃13; 
function mouseOver() {
  document.getElementsByClassName("body").style.backgroundColor = "black"
}

function mouseOut() {
  document.getElementsByClassName("body").style.backgroundColor = "white"
}
＆＃13; 
.college .image {
  left: 100px;
  top: 475px;
  position: absolute
}

.college:hover .imagefirst {
  opacity: 0.2;
}

.college .imagesecond {
  width: 550px;
  height: 900px;
  transform: translate(-110px, 500px);
  transition: transform 0.5s ease-in-out 0.25s;
  border-radius: 8px;
  overflow: hidden;
}

.college:hover>.imagesecond {
  transform: translate(-110px, -500px);
}

.college:hover>body {
  background-color: black
}

.lycee .image {
  left: 700px;
  top: 500px;
  position: absolute
}

.lycee .imagefourth {
  width: 537px;
  height: 600px;
  transform: translate(-160px, 500px);
  transition: transform 0.5s ease-in-out 0.2s;
  border-radius: 8px;
  overflow: hidden;
}

.lycee:hover>.imagefourth {
  transform: translate(-160px, -325px);
}

.formations .image {
  left: 1250px;
  top: 510px;
  position: absolute;
}

.formations .imagesixth {
  width: 550px;
  height: 900px;
  transform: translate(-100px, 400px);
  transition: transform 0.5s ease-in-out 0.2s;
  border-radius: 8px;
  overflow: hidden
}

.formations:hover>.imagesixth {
  transform: translate(-173px, -600px);
}

body {
  background: url("accueil.png") 33em 0% fixed no-repeat;
  position: fixed;
  background-color: white/* rgb(0,85,170); */
}
＆＃13; 
<!doctype html>
<html>

<head>
  <meta charset="utf-8" />
  <link rel="stylesheet" href="css.css" />

  <title> sainte marie </title>

</head>

<body>
  <div class="saintemarie">
    <a href="college/collegesaintemarie.html">
      <div onmouseover="mouseover()" onmouseout="mouseout()" class="college">
        <img class="image imagefirst" src="http://via.placeholder.com/196x175" />
        <img class="image imagesecond" src="http://via.placeholder.com/320x440" />
      </div>
    </a>

    <a href="lycee/lyceesaintemarie.html">
      <div class="lycee">
        <img class="image imagethird" src="http://via.placeholder.com/183x140" />
        <img class="image imagefourth" src="http://via.placeholder.com/320x440" />
      </div>
    </a>

    <a href="c&formation/c&fsaintemarie.html">
      <div class="formations">
        <img class="image imagefifth" src="http://via.placeholder.com/172x153" />
        <img class="image imagesixth" src="http://via.placeholder.com/320x440" />
      </div>
    </a>
  </div>


</body>

</html>
＆＃13;
＆＃13;
＆＃13;

我不能使用jQuery orortherwise我不会首先尝试提出这个问题，我需要知道如何将JS文件中的悬停效果应用到我的html和css页面

-edit -

我已经被教会如何使用鼠标悬停和背景着色但我想问另一件事，它是关于不透明度，我想把不透明度放在其他div上我决定做同样的事情在我在document.lycee.style.opacity = "0.1";和document.formations.style.opacity = "0.1";之前所教的内容，但它实际上不起作用，就像document.body.style.opacity = "0.1";一样，它改变了整个页面的不透明度。你能帮我最后一次吗？

5 个答案:

答案 0 :(得分：2)

确保在内容后加载您的Javascript代码，并将onmouseOver替换为onmouseover。

而不是 document.getElementsByClassName("body").style.backgroundColor = "black" 你可以这样做 document.body.style.backgroundColor = 'red';

如果你想玩DIV＆＃39> 

var divs = document.getElementsByTagName('div');
for(var i=0; i < divs.length; i++) {
  divs[i].style.opacity = "0.8";
}

如果您只想更改具有className

的特定元素的样式 
var divs = document.getElementsByClassName('classNameHere');
for(var i=0; i < divs.length; i++) {
  divs[i].style.opacity = "0.8";
}

编辑！

答案 1 :(得分：2)

正文不是一个类，所以这个声明不起作用，document.getElementsByClassName("body").style.backgroundColor = "black"

要选择正文，您可以使用document.body或document.getElementsByTagName('body')[0]; 

function mouseOver() {
  document.body.style.backgroundColor = "black"
}

function mouseOut() {
  document.body.style.backgroundColor = "white"
}
.college .image {
  left: 100px;
  top: 475px;
  position: absolute
}

.college:hover .imagefirst {
  opacity: 0.2;
}

.college .imagesecond {
  width: 550px;
  height: 900px;
  transform: translate(-110px, 500px);
  transition: transform 0.5s ease-in-out 0.25s;
  border-radius: 8px;
  overflow: hidden;
}

.college:hover>.imagesecond {
  transform: translate(-110px, -500px);
}

.college:hover>body {
  background-color: black
}

.lycee .image {
  left: 700px;
  top: 500px;
  position: absolute
}

.lycee .imagefourth {
  width: 537px;
  height: 600px;
  transform: translate(-160px, 500px);
  transition: transform 0.5s ease-in-out 0.2s;
  border-radius: 8px;
  overflow: hidden;
}

.lycee:hover>.imagefourth {
  transform: translate(-160px, -325px);
}

.formations .image {
  left: 1250px;
  top: 510px;
  position: absolute;
}

.formations .imagesixth {
  width: 550px;
  height: 900px;
  transform: translate(-100px, 400px);
  transition: transform 0.5s ease-in-out 0.2s;
  border-radius: 8px;
  overflow: hidden
}

.formations:hover>.imagesixth {
  transform: translate(-173px, -600px);
}

body {
  background: url("accueil.png") 33em 0% fixed no-repeat;
  position: fixed;
  background-color: white/* rgb(0,85,170); */
}
<!doctype html>
<html>

<head>
  <meta charset="utf-8" />
  <link rel="stylesheet" href="css.css" />

  <title> sainte marie </title>

</head>

<body>
  <div class="saintemarie">
    <a href="college/collegesaintemarie.html">
      <div onmouseOver="mouseOver()" onmouseout="mouseOut()" class="college">
        <img class="image imagefirst" src="http://via.placeholder.com/196x175" />
        <img class="image imagesecond" src="http://via.placeholder.com/320x440" />
      </div>
    </a>

    <a href="lycee/lyceesaintemarie.html">
      <div class="lycee">
        <img class="image imagethird" src="http://via.placeholder.com/183x140" />
        <img class="image imagefourth" src="http://via.placeholder.com/320x440" />
      </div>
    </a>

    <a href="c&formation/c&fsaintemarie.html">
      <div class="formations">
        <img class="image imagefifth" src="http://via.placeholder.com/172x153" />
        <img class="image imagesixth" src="http://via.placeholder.com/320x440" />
      </div>
    </a>
  </div>


</body>

</html>

答案 2 :(得分：1)

这样的东西？

＆＃13;
＆＃13; 
function mouseOver() {
  document.body.style.backgroundColor = "black"
}

function mouseOut() {
  document.body.style.backgroundColor = "white"
}
＆＃13; 
.college{
  height: 100px;
  width: 100px;
  border: 1px solid black;
}

.college .image {
  left: 100px;
  top: 475px;
  position: absolute
}

.college:hover .imagefirst {
  opacity: 0.2;
}

.college .imagesecond {
  width: 550px;
  height: 900px;
  transform: translate(-110px, 500px);
  transition: transform 0.5s ease-in-out 0.25s;
  border-radius: 8px;
  overflow: hidden;
}

.college:hover>.imagesecond {
  transform: translate(-110px, -500px);
}

.college:hover>body {
  background-color: black
}

.lycee .image {
  left: 700px;
  top: 500px;
  position: absolute
}

.lycee .imagefourth {
  width: 537px;
  height: 600px;
  transform: translate(-160px, 500px);
  transition: transform 0.5s ease-in-out 0.2s;
  border-radius: 8px;
  overflow: hidden;
}

.lycee:hover>.imagefourth {
  transform: translate(-160px, -325px);
}

.formations .image {
  left: 1250px;
  top: 510px;
  position: absolute;
}

.formations .imagesixth {
  width: 550px;
  height: 900px;
  transform: translate(-100px, 400px);
  transition: transform 0.5s ease-in-out 0.2s;
  border-radius: 8px;
  overflow: hidden
}

.formations:hover>.imagesixth {
  transform: translate(-173px, -600px);
}

body {
  background: url("accueil.png") 33em 0% fixed no-repeat;
  position: fixed;
  background-color: white/* rgb(0,85,170); */
}
＆＃13; 
<!doctype html>
<html>

<head>
  <meta charset="utf-8" />
  <link rel="stylesheet" href="css.css" />

  <title> sainte marie </title>

</head>

<body>
  <div class="saintemarie">
    <a href="college/collegesaintemarie.html">
      <div onmouseover="mouseOver();" onmouseout="mouseOut();" class="college">
        <img class="image imagefirst" src="http://via.placeholder.com/196x175" />
        <img class="image imagesecond" src="http://via.placeholder.com/320x440" />
      </div>
    </a>

    <a href="lycee/lyceesaintemarie.html">
      <div class="lycee">
        <img class="image imagethird" src="http://via.placeholder.com/183x140" />
        <img class="image imagefourth" src="http://via.placeholder.com/320x440" />
      </div>
    </a>

    <a href="c&formation/c&fsaintemarie.html">
      <div class="formations">
        <img class="image imagefifth" src="http://via.placeholder.com/172x153" />
        <img class="image imagesixth" src="http://via.placeholder.com/320x440" />
      </div>
    </a>
  </div>


</body>

</html>
＆＃13;
＆＃13;
＆＃13;

答案 3 :(得分：1)

好的！但是大写和小写字母的小错误

1）

please see your function name carefully 
<div onmouseover="mouseover()" onmouseout="mouseout()" class="college">

'O' should be capital as you defined it mouseOver() and mouseOut();

2）

for using byName you must have tag with that name so for using 
document.getElementsByClassName("body").style.backgroundColor = "black";
add name="body" in <body>  
for example <body name="body">

或

  simply use byTagName atribute like this
document.getElementsByTagName("body")[0].style.backgroundColor = "black";

快乐编码，:-)

答案 4 :(得分：0)

您正在尝试使用正在查找课程的getElementsByClassName获取代码，因此请使用下面代码段中的getElementsByTagName或将class="body"添加到正文代码

function mouseOver() {
  document.getElementsByTagName("body")[0].style.backgroundColor = "#000";
}

function mouseOut() {
  document.getElementsByTagName("body")[0].style.backgroundColor = "white";
}
.college .image {
  left: 100px;
  top: 475px;
  position: absolute
}
.college{
border:1px solid black;
height: 50px;
width:50px;
}
.college:hover .imagefirst {
  opacity: 0.2;
}

.college .imagesecond {
  width: 550px;
  height: 900px;
  transform: translate(-110px, 500px);
  transition: transform 0.5s ease-in-out 0.25s;
  border-radius: 8px;
  overflow: hidden;
}

.college:hover>.imagesecond {
  transform: translate(-110px, -500px);
}

.college:hover>body {
  background-color: black
}

.lycee .image {
  left: 700px;
  top: 500px;
  position: absolute
}

.lycee .imagefourth {
  width: 537px;
  height: 600px;
  transform: translate(-160px, 500px);
  transition: transform 0.5s ease-in-out 0.2s;
  border-radius: 8px;
  overflow: hidden;
}

.lycee:hover>.imagefourth {
  transform: translate(-160px, -325px);
}

.formations .image {
  left: 1250px;
  top: 510px;
  position: absolute;
}

.formations .imagesixth {
  width: 550px;
  height: 900px;
  transform: translate(-100px, 400px);
  transition: transform 0.5s ease-in-out 0.2s;
  border-radius: 8px;
  overflow: hidden
}

.formations:hover>.imagesixth {
  transform: translate(-173px, -600px);
}

body {
  background: url("accueil.png") 33em 0% fixed no-repeat;
  position: fixed;
  background-color: white/* rgb(0,85,170); */
}
<!doctype html>
<html>

<head>
  <meta charset="utf-8" />
  <link rel="stylesheet" href="css.css" />

  <title> sainte marie </title>

</head>

<body>
  <div class="saintemarie">
    <a href="college/collegesaintemarie.html">
      <div onmouseOver="mouseOver()" onmouseout="mouseOut()" class="college">
        <img class="image imagefirst" src="http://via.placeholder.com/196x175" />
        <img class="image imagesecond" src="http://via.placeholder.com/320x440" />
      </div>
    </a>

    <a href="lycee/lyceesaintemarie.html">
      <div class="lycee">
        <img class="image imagethird" src="http://via.placeholder.com/183x140" />
        <img class="image imagefourth" src="http://via.placeholder.com/320x440" />
      </div>
    </a>

    <a href="c&formation/c&fsaintemarie.html">
      <div class="formations">
        <img class="image imagefifth" src="http://via.placeholder.com/172x153" />
        <img class="image imagesixth" src="http://via.placeholder.com/320x440" />
      </div>
    </a>
  </div>


</body>

</html>

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