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CSS animation-timing-function 属性 详解

css3基础 2022-07-14 15:52:00小码哥的IT人生shichen

CSS animation-timing-function 属性

定义和用法

animation-timing-function 规定动画的速度曲线。

速度曲线定义动画从一套 CSS 样式变为另一套所用的时间。

速度曲线用于使变化更为平滑。

另请参阅：

CSS3 教程：CSS 动画

HTML DOM 参考手册：animationTimingFunction 属性

实例

实例 1

从开头到结尾以相同的速度来播放动画：

div
{
animation-timing-function:2s;
}

 

完整实例【亲自试一试】：

<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:100px;
background:red;
position:relative;
animation:mymove 5s infinite;
animation-timing-function:linear;
/* Safari and Chrome */
-webkit-animation:mymove 5s infinite;
-webkit-animation-timing-function:linear;
}
@keyframes mymove
{
from {left:0px;}
to {left:200px;}
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
from {left:0px;}
to {left:200px;}
}
</style>
</head>
<body>
<p><strong>注释：</strong>Internet Explorer 9 以及更早的版本不支持 animation-timing-function 属性。</p>
<div></div>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果：http://www.phpcodeweb.com/runjs.html

实例 2

为了更好地理解不同的定时函数值，这里提供了设置五个不同值的五个不同的 div 元素：

#div1 {animation-timing-function: linear;}
#div2 {animation-timing-function: ease;}
#div3 {animation-timing-function: ease-in;}
#div4 {animation-timing-function: ease-out;}
#div5 {animation-timing-function: ease-in-out;}

 

完整实例【亲自试一试】：

<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:50px;
background:red;
color:white;
font-weight:bold;
position:relative;
animation:mymove 5s infinite;
-webkit-animation:mymove 5s infinite; /* Safari and Chrome */
}
#div1 {animation-timing-function:linear;}
#div2 {animation-timing-function:ease;}
#div3 {animation-timing-function:ease-in;}
#div4 {animation-timing-function:ease-out;}
#div5 {animation-timing-function:ease-in-out;}
/* Safari and Chrome: */
#div1 {-webkit-animation-timing-function:linear;}
#div2 {-webkit-animation-timing-function:ease;}
#div3 {-webkit-animation-timing-function:ease-in;}
#div4 {-webkit-animation-timing-function:ease-out;}
#div5 {-webkit-animation-timing-function:ease-in-out;}
@keyframes mymove
{
from {left:0px;}
to {left:300px;}
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
from {left:0px;}
to {left:300px;}
}
</style>
</head>
<body>
<p><strong>注释：</strong>Internet Explorer 9 以及更早的版本不支持 animation-timing-function 属性。</p>
<div id="div1">linear</div>
<div id="div2">ease</div>
<div id="div3">ease-in</div>
<div id="div4">ease-out</div>
<div id="div5">ease-in-out</div>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果：http://www.phpcodeweb.com/runjs.html

实例 3

与上例相同，但是通过 cubic-bezier 函数来定义速度曲线：

#div1 {animation-timing-function: cubic-bezier(0,0,1,1);}
#div2 {animation-timing-function: cubic-bezier(0.25,0.1,0.25,1);}
#div3 {animation-timing-function: cubic-bezier(0.42,0,1,1);}
#div4 {animation-timing-function: cubic-bezier(0,0,0.58,1);}
#div5 {animation-timing-function: cubic-bezier(0.42,0,0.58,1);}

 

完整实例【亲自试一试】：

<!DOCTYPE html>
<html>
<head>
<style>
div
{
width:100px;
height:50px;
background:red;
color:white;
font-weight:bold;
position:relative;
animation:mymove 5s infinite;
-webkit-animation:mymove 5s infinite; /* Safari and Chrome */
}
#div1 {animation-timing-function:cubic-bezier(0,0,0.25,1);}
#div2 {animation-timing-function:cubic-bezier(0.25,0.1,0.25,1);}
#div3 {animation-timing-function:cubic-bezier(0.42,0,1,1);}
#div4 {animation-timing-function:cubic-bezier(0,0,0.58,1);}
#div5 {animation-timing-function:cubic-bezier(0.42,0,0.58,1);}
/* Safari and Chrome: */
#div1 {-webkit-animation-timing-function:cubic-bezier(0,0,1,1);}
#div2 {-webkit-animation-timing-function:cubic-bezier(0.25,0.1,0.25,1);}
#div3 {-webkit-animation-timing-function:cubic-bezier(0.42,0,1,1);}
#div4 {-webkit-animation-timing-function:cubic-bezier(0,0,0.58,1);}
#div5 {-webkit-animation-timing-function:cubic-bezier(0.42,0,0.58,1);}
@keyframes mymove
{
from {left:0px;}
to {left:300px;}
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
from {left:0px;}
to {left:300px;}
}
</style>
</head>
<body>
<p><strong>注释：</strong>Internet Explorer 9 以及更早的版本不支持 animation-timing-function 属性。</p>
<div id="div1">linear</div>
<div id="div2">ease</div>
<div id="div3">ease-in</div>
<div id="div4">ease-out</div>
<div id="div5">ease-in-out</div>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果：http://www.phpcodeweb.com/runjs.html

CSS 语法

animation-timing-function: value;

animation-timing-function 使用名为三次贝塞尔（Cubic Bezier）函数的数学函数，来生成速度曲线。您能够在该函数中使用自己的值，也可以预定义的值：

值 描述 测试
linear 动画从头到尾的速度是相同的。 测试
ease 默认。动画以低速开始，然后加快，在结束前变慢。 测试
ease-in 动画以低速开始。 测试
ease-out 动画以低速结束。 测试
ease-in-out 动画以低速开始和结束。 测试
cubic-bezier(n,n,n,n) 在 cubic-bezier 函数中自己的值。可能的值是从 0 到 1 的数值。  

提示：请试着在下面的“亲自试一试”功能中使用不同的值。

技术细节

默认值： ease
继承性： no
版本： CSS3
JavaScript 语法： object.style.animationTimingFunction="linear"

浏览器支持

表格中的数字注明了完全支持该属性的首个浏览器版本。

带 -webkit-、-moz- 或 -o- 的数字表示使用前缀的首个版本。

Chrome Edge Firefox Safari Opera
Chrome Edge Firefox Safari Opera
43.0
4.0 -webkit-		 10.0 16.0
5.0 -moz-		 9.0
4.0 -webkit-		 30.0
15.0 -webkit-
12.0 -o-

完整实例1：

<!DOCTYPE html>
<html lang="zh_CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Demo</title>
<style>
ul, li{margin:0;padding:0;}
li{list-style:none;}
div#wrapper{width: 960px;margin: 0 auto;padding: 0;text-align: left;border:1px solid #c5c5c5;}
#SelArea{float: left;width: 480px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#SelArea p{margin:20px;	}
#result{float: left;width: 478px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#CodeArea{width: 440px;margin:0;margin-left: 10px;margin-bottom:10px;padding: 5px;font-family: courier new;color: #222222;background-color: #f1f1f1;border: 1px solid #c3c3c3;}
#DemoArea{width: 450px;height: 280px;margin:0;padding:0;margin-left: 10px;background-color: #ffffff;border: 1px solid #c3c3c3;}
div#MyDIV
{
width:100px;
height:100px;
background:red;
position:relative;
animation:mymove 5s infinite;
-webkit-animation:mymove 5s infinite;
}
@keyframes mymove
{
from {left:0px;}
to {left:330px;}
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
from {left:0px;}
to {left:330px;}
}
div#MyDIV
{
animation-timing-function:linear;
-webkit-animation-timing-function:linear;
}
</style>
<body>
<div id="wrapper">
<div id="SelArea">
<h2>CSS 属性：</h2>
<h3>animation-timing-function:</h3>
<form action="javascript:return false;">
<ul>
<input type="hidden" id="PreSelectedValue" value="" />
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_1" value="linear" checked="checked" />linear</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_2" value="ease" />ease</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_3" value="ease-in" />ease-in</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_4" value="ease-out" />ease-out</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_5" value="ease-in-out" />ease-in-out</li>
</ul>
</form>
</div>
<div id="result">
<h2>结果：</h2>
<div id="DemoArea">
<div id="MyDIV"></div>
</div>
<h2>CSS 代码：</h2>
<pre id="CodeArea">
div#MyDIV
{
animation-timing-function:<span id="CodeValue">linear</span>;
}
</pre>
</div>
<script>
function test_demo_val(strValue)
{
var strId="MyDIV"
document.getElementById(strId).style.animationTimingFunction=strValue;
document.getElementById(strId).style.WebkitAnimationTimingFunction=strValue;
document.getElementById(strId).style.MozAnimationTimingFunction=strValue;
document.getElementById("CodeValue").innerHTML=strValue;
}
function tiy_onload(){
    var PreVal=""
    PreVal=document.getElementById("PreSelectedValue").value
    if (PreVal!=""){
        test_demo_val(PreVal)
        var x=document.getElementsByTagName("input")
        var l=x.length
        for (i=0;i<l;i++){
            if (x[i].value==PreVal){
                x[i].checked=true
            }
        }
    }
}
function test_demo(obj){
    test_demo_val(obj.value)
}
tiy_onload()
</script>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果：http://www.phpcodeweb.com/runjs.html

完整实例2：

<!DOCTYPE html>
<html lang="zh_CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Demo</title>
<style>
ul, li{margin:0;padding:0;}
li{list-style:none;}
div#wrapper{width: 960px;margin: 0 auto;padding: 0;text-align: left;border:1px solid #c5c5c5;}
#SelArea{float: left;width: 480px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#SelArea p{margin:20px;	}
#result{float: left;width: 478px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#CodeArea{width: 440px;margin:0;margin-left: 10px;margin-bottom:10px;padding: 5px;font-family: courier new;color: #222222;background-color: #f1f1f1;border: 1px solid #c3c3c3;}
#DemoArea{width: 450px;height: 280px;margin:0;padding:0;margin-left: 10px;background-color: #ffffff;border: 1px solid #c3c3c3;}
div#MyDIV
{
width:100px;
height:100px;
background:red;
position:relative;
animation:mymove 5s infinite;
-webkit-animation:mymove 5s infinite;
}
@keyframes mymove
{
from {left:0px;}
to {left:330px;}
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
from {left:0px;}
to {left:330px;}
}
div#MyDIV
{
animation-timing-function:linear;
-webkit-animation-timing-function:linear;
}
</style>
<body>
<div id="wrapper">
<div id="SelArea">
<h2>CSS 属性：</h2>
<h3>animation-timing-function:</h3>
<form action="javascript:return false;">
<ul>
<input type="hidden" id="PreSelectedValue" value="ease" />
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_1" value="linear" />linear</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_2" value="ease" />ease</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_3" value="ease-in" />ease-in</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_4" value="ease-out" />ease-out</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_5" value="ease-in-out" />ease-in-out</li>
</ul>
</form>
</div>
<div id="result">
<h2>结果：</h2>
<div id="DemoArea">
<div id="MyDIV"></div>
</div>
<h2>CSS 代码：</h2>
<pre id="CodeArea">
div#MyDIV
{
animation-timing-function:<span id="CodeValue">linear</span>;
}
</pre>
</div>
<script>
function test_demo_val(strValue)
{
var strId="MyDIV"
document.getElementById(strId).style.animationTimingFunction=strValue;
document.getElementById(strId).style.WebkitAnimationTimingFunction=strValue;
document.getElementById(strId).style.MozAnimationTimingFunction=strValue;
document.getElementById("CodeValue").innerHTML=strValue;
}
function tiy_onload(){
    var PreVal=""
    PreVal=document.getElementById("PreSelectedValue").value
    if (PreVal!=""){
        test_demo_val(PreVal)
        var x=document.getElementsByTagName("input")
        var l=x.length
        for (i=0;i<l;i++){
            if (x[i].value==PreVal){
                x[i].checked=true
            }
        }
    }
}
function test_demo(obj){
    test_demo_val(obj.value)
}
tiy_onload()
</script>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果：http://www.phpcodeweb.com/runjs.html

完整实例3：

<!DOCTYPE html>
<html lang="zh_CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Demo</title>
<style>
ul, li{margin:0;padding:0;}
li{list-style:none;}
div#wrapper{width: 960px;margin: 0 auto;padding: 0;text-align: left;border:1px solid #c5c5c5;}
#SelArea{float: left;width: 480px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#SelArea p{margin:20px;	}
#result{float: left;width: 478px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#CodeArea{width: 440px;margin:0;margin-left: 10px;margin-bottom:10px;padding: 5px;font-family: courier new;color: #222222;background-color: #f1f1f1;border: 1px solid #c3c3c3;}
#DemoArea{width: 450px;height: 280px;margin:0;padding:0;margin-left: 10px;background-color: #ffffff;border: 1px solid #c3c3c3;}
div#MyDIV
{
width:100px;
height:100px;
background:red;
position:relative;
animation:mymove 5s infinite;
-webkit-animation:mymove 5s infinite;
}
@keyframes mymove
{
from {left:0px;}
to {left:330px;}
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
from {left:0px;}
to {left:330px;}
}
div#MyDIV
{
animation-timing-function:linear;
-webkit-animation-timing-function:linear;
}
</style>
<body>
<div id="wrapper">
<div id="SelArea">
<h2>CSS 属性：</h2>
<h3>animation-timing-function:</h3>
<form action="javascript:return false;">
<ul>
<input type="hidden" id="PreSelectedValue" value="ease-in" />
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_1" value="linear" />linear</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_2" value="ease" />ease</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_3" value="ease-in" />ease-in</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_4" value="ease-out" />ease-out</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_5" value="ease-in-out" />ease-in-out</li>
</ul>
</form>
</div>
<div id="result">
<h2>结果：</h2>
<div id="DemoArea">
<div id="MyDIV"></div>
</div>
<h2>CSS 代码：</h2>
<pre id="CodeArea">
div#MyDIV
{
animation-timing-function:<span id="CodeValue">linear</span>;
}
</pre>
</div>
<script>
function test_demo_val(strValue)
{
var strId="MyDIV"
document.getElementById(strId).style.animationTimingFunction=strValue;
document.getElementById(strId).style.WebkitAnimationTimingFunction=strValue;
document.getElementById(strId).style.MozAnimationTimingFunction=strValue;
document.getElementById("CodeValue").innerHTML=strValue;
}
function tiy_onload(){
    var PreVal=""
    PreVal=document.getElementById("PreSelectedValue").value
    if (PreVal!=""){
        test_demo_val(PreVal)
        var x=document.getElementsByTagName("input")
        var l=x.length
        for (i=0;i<l;i++){
            if (x[i].value==PreVal){
                x[i].checked=true
            }
        }
    }
}
function test_demo(obj){
    test_demo_val(obj.value)
}
tiy_onload()
</script>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果：http://www.phpcodeweb.com/runjs.html

完整实例4：

<!DOCTYPE html>
<html lang="zh_CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Demo</title>
<style>
ul, li{margin:0;padding:0;}
li{list-style:none;}
div#wrapper{width: 960px;margin: 0 auto;padding: 0;text-align: left;border:1px solid #c5c5c5;}
#SelArea{float: left;width: 480px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#SelArea p{margin:20px;	}
#result{float: left;width: 478px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#CodeArea{width: 440px;margin:0;margin-left: 10px;margin-bottom:10px;padding: 5px;font-family: courier new;color: #222222;background-color: #f1f1f1;border: 1px solid #c3c3c3;}
#DemoArea{width: 450px;height: 280px;margin:0;padding:0;margin-left: 10px;background-color: #ffffff;border: 1px solid #c3c3c3;}
div#MyDIV
{
width:100px;
height:100px;
background:red;
position:relative;
animation:mymove 5s infinite;
-webkit-animation:mymove 5s infinite;
}
@keyframes mymove
{
from {left:0px;}
to {left:330px;}
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
from {left:0px;}
to {left:330px;}
}
div#MyDIV
{
animation-timing-function:linear;
-webkit-animation-timing-function:linear;
}
</style>
<body>
<div id="wrapper">
<div id="SelArea">
<h2>CSS 属性：</h2>
<h3>animation-timing-function:</h3>
<form action="javascript:return false;">
<ul>
<input type="hidden" id="PreSelectedValue" value="ease-out" />
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_1" value="linear" />linear</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_2" value="ease" />ease</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_3" value="ease-in" />ease-in</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_4" value="ease-out" />ease-out</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_5" value="ease-in-out" />ease-in-out</li>
</ul>
</form>
</div>
<div id="result">
<h2>结果：</h2>
<div id="DemoArea">
<div id="MyDIV"></div>
</div>
<h2>CSS 代码：</h2>
<pre id="CodeArea">
div#MyDIV
{
animation-timing-function:<span id="CodeValue">linear</span>;
}
</pre>
</div>
<script>
function test_demo_val(strValue)
{
var strId="MyDIV"
document.getElementById(strId).style.animationTimingFunction=strValue;
document.getElementById(strId).style.WebkitAnimationTimingFunction=strValue;
document.getElementById(strId).style.MozAnimationTimingFunction=strValue;
document.getElementById("CodeValue").innerHTML=strValue;
}
function tiy_onload(){
    var PreVal=""
    PreVal=document.getElementById("PreSelectedValue").value
    if (PreVal!=""){
        test_demo_val(PreVal)
        var x=document.getElementsByTagName("input")
        var l=x.length
        for (i=0;i<l;i++){
            if (x[i].value==PreVal){
                x[i].checked=true
            }
        }
    }
}
function test_demo(obj){
    test_demo_val(obj.value)
}
tiy_onload()
</script>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果：http://www.phpcodeweb.com/runjs.html

完整实例5：

<!DOCTYPE html>
<html lang="zh_CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Demo</title>
<style>
ul, li{margin:0;padding:0;}
li{list-style:none;}
div#wrapper{width: 960px;margin: 0 auto;padding: 0;text-align: left;border:1px solid #c5c5c5;}
#SelArea{float: left;width: 480px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#SelArea p{margin:20px;	}
#result{float: left;width: 478px;margin:0;padding:0;border: 0px solid #c5c5c5;}
#CodeArea{width: 440px;margin:0;margin-left: 10px;margin-bottom:10px;padding: 5px;font-family: courier new;color: #222222;background-color: #f1f1f1;border: 1px solid #c3c3c3;}
#DemoArea{width: 450px;height: 280px;margin:0;padding:0;margin-left: 10px;background-color: #ffffff;border: 1px solid #c3c3c3;}
div#MyDIV
{
width:100px;
height:100px;
background:red;
position:relative;
animation:mymove 5s infinite;
-webkit-animation:mymove 5s infinite;
}
@keyframes mymove
{
from {left:0px;}
to {left:330px;}
}
@-webkit-keyframes mymove /* Safari and Chrome */
{
from {left:0px;}
to {left:330px;}
}
div#MyDIV
{
animation-timing-function:linear;
-webkit-animation-timing-function:linear;
}
</style>
<body>
<div id="wrapper">
<div id="SelArea">
<h2>CSS 属性：</h2>
<h3>animation-timing-function:</h3>
<form action="javascript:return false;">
<ul>
<input type="hidden" id="PreSelectedValue" value="ease-in-out" />
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_1" value="linear" />linear</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_2" value="ease" />ease</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_3" value="ease-in" />ease-in</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_4" value="ease-out" />ease-out</li>
<li><input autocomplete="off" type="radio" name="rpos" onClick="test_demo(this)" id="value_5" value="ease-in-out" />ease-in-out</li>
</ul>
</form>
</div>
<div id="result">
<h2>结果：</h2>
<div id="DemoArea">
<div id="MyDIV"></div>
</div>
<h2>CSS 代码：</h2>
<pre id="CodeArea">
div#MyDIV
{
animation-timing-function:<span id="CodeValue">linear</span>;
}
</pre>
</div>
<script>
function test_demo_val(strValue)
{
var strId="MyDIV"
document.getElementById(strId).style.animationTimingFunction=strValue;
document.getElementById(strId).style.WebkitAnimationTimingFunction=strValue;
document.getElementById(strId).style.MozAnimationTimingFunction=strValue;
document.getElementById("CodeValue").innerHTML=strValue;
}
function tiy_onload(){
    var PreVal=""
    PreVal=document.getElementById("PreSelectedValue").value
    if (PreVal!=""){
        test_demo_val(PreVal)
        var x=document.getElementsByTagName("input")
        var l=x.length
        for (i=0;i<l;i++){
            if (x[i].value==PreVal){
                x[i].checked=true
            }
        }
    }
}
function test_demo(obj){
    test_demo_val(obj.value)
}
tiy_onload()
</script>
</body>
</html>

可以使用本站在线JavaScript测试工具测试上述代码运行效果：http://www.phpcodeweb.com/runjs.html

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