javascript如何取得內聯樣式與嵌入式樣式的實例程式碼分享
- 黄舟原創
- 2017-06-04 10:39:451966瀏覽
這篇文章主要介紹了關於javascript取得內聯樣式與嵌入式樣式的實例，具有一定的參考價值，有興趣的小夥伴們可以參考一下
透過style屬性設定背景圖案
<!--html--> <p id="change"> change color </p>
/*css*/
#change {
border: 1px solid black;
width: 200px;
height: 200px;
text-align: center;
line-height: 200px;
}//js change.style.backgroundColor="purple";
#在側邊欄設定一個顏色選擇器，將change的背景顏色設定為選擇的顏色，此時顏色選擇器的顏色是使用內聯樣式的方式添加的。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>css</title>
<style>
* {
margin: 0;
padding: 0;
}
.wrap {
width: 220px;
height: 200px;
position: absolute;
top: 300px;
left: -172px;
}
.open-close {
height: 45px;
width: 48px;
background: url("open-close.png") no-repeat;
background-size: contain;
border: 1px solid grey;
border-left: none;
position: absolute;
top: 0;
right: 0;
z-index: 2;
}
.changer {
height: 150px;
width: 170px;
position: absolute;
top: 0;
left: 0;
border: 1px solid grey;
text-align: center;
padding-top: 8px;
}
.list > li {
display: block;
width: 36px;
height: 36px;
float: left;
margin-left: 9%;
margin-top: 10%;
}
#change {
border: 1px solid black;
width: 200px;
height: 200px;
text-align: center;
line-height: 200px;
}
</style>
</head>
<body>
<p class="wrap" id="wrap">
<!--html-->
<p class="open-close" id="open"></p>
<p class="changer">
<span>颜色选择器</span>
<ul class="list">
<li class="color-orange" style="background-color: orange"></li>
<li class="color-red" style="background-color: red"></li>
<li class="color-blue" style="background-color: blue"></li>
<li class="color-black" style="background-color: black"></li>
<li class="color-green" style="background-color: green"></li>
<li class="color-pink" style="background-color: pink"></li>
</ul>
</p>
</p>
<p id="change">
change color
</p>
<script>
var open = document.getElementById("open");
var wrap = document.getElementById("wrap");
var list = document.getElementById("list");
var change = document.getElementById("change");
var color_change = document.getElementsByTagName("li");
change.style.backgroundColor = "purple";
open.onmouseover = function () {
wrap.style.left = 0 + "px";
};
open.onclick = function () {
wrap.style.left = -172 + "px";
};
for (var i = 0; i < color_change.length; i++) {
color_change[i].id = i;
color_change[i].onclick = function () {
change.style.backgroundColor = color_change[this.id].style.backgroundColor;
}
}
</script>
</body>
</html>#問題：
當顏色選擇器的顏色是使用嵌入式或外部引入的方式添加時，javascript的style屬性無效，取得不到顏色值。
解決方法：
javascript的style屬性只能取得內聯樣式，對於外部引入樣式和嵌入式樣式需要用currentStyle屬性。但是，currentStyle在Firefox和Chrome下不支持，需要使用以下相容性代碼:
HTMLElement.prototype.defineGetter("currentStyle", function () {
return this.ownerDocument.defaultView.getComputedStyle(this, null);
});
##
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
* {
margin: 0;
padding: 0;
}
.wrap {
width: 220px;
height: 200px;
position: absolute;
top: 300px;
left: -172px;
}
.open-close {
height: 45px;
width: 48px;
background: url("open-close.png") no-repeat;
background-size: contain;
border: 1px solid grey;
border-left: none;
position: absolute;
top: 0;
right: 0;
z-index: 2;
}
.changer {
height: 150px;
width: 170px;
position: absolute;
top: 0;
left: 0;
border: 1px solid grey;
text-align: center;
padding-top: 8px;
}
.list > li {
display: block;
width: 36px;
height: 36px;
float: left;
margin-left: 9%;
margin-top: 10%;
}
.color-orange {
background-color: orange;
}
.color-red {
background-color: red;
}
.color-blue {
background-color: blue;
}
.color-blank {
background-color: black;
}
.color-green {
background-color: green;
}
.color-pink {
background-color: pink;
}
#change {
border: 1px solid black;
width: 200px;
height: 200px;
text-align: center;
line-height: 200px;
}
</style>
</head>
<body>
<p class="wrap" id="wrap">
<!--html-->
<p class="open-close" id="open"></p>
<p class="changer">
<span>颜色的选择</span>
<ul class="list">
<li class="color-orange"></li>
<li class="color-red"></li>
<li class="color-blue"></li>
<li class="color-blank"></li>
<li class="color-green"></li>
<li class="color-pink"></li>
</ul>
</p>
</p>
<p id="change">
change color
</p>
<script>
HTMLElement.prototype.defineGetter("currentStyle", function () {
return this.ownerDocument.defaultView.getComputedStyle(this, null);
});
var open = document.getElementById("open");
var wrap = document.getElementById("wrap");
var list = document.getElementById("list");
var change = document.getElementById("change");
var color_change = document.getElementsByTagName("li");
change.style.backgroundColor="purple";
open.onmouseover = function () {
wrap.style.left = 0 + "px";
};
open.onclick = function () {
wrap.style.left = -172 + "px";
};
for (var i = 0; i < color_change.length; i++) {
color_change[i].id = i;
color_change[i].onclick = function () {
change.style.backgroundColor = color_change[this.id].currentStyle.backgroundColor;
}
}
</script>
</body>
</html>
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