发布于 2017-01-11 05:55:53 | 125 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312" />
<title>js 三级关联菜单</title>
</head>
<body>
<FORM name="isc">
<select name="example" size="1" onChange="redirect(this.options.selectedIndex)">
<option selected>---Select1----</option>
<option>Webmaster Sites</option>
<option>News Sites</option>
</select>
<select name="stage2" size="1" onChange="redirect1(this.options.selectedIndex)">
<option value=" " selected> </option>
<option value=" " selected>---Select2-----</option>
<option value=" " selected>---Select2-----</option>
</select>
<select name="stage3" size="1" onChange="redirect2(this.options.selectedIndex)">
<option value=" " selected> </option>
<option value=" " selected>---Select3-----</option>
<option value=" " selected>---Select3-----</option>
</select>
<script>
var groups=document.isc.example.options.length
var group=new Array(groups)
for (I=0; I<groups; I++)
group[I]=new Array()
group[0][0]=new Option("---Select2---"," ");
group[1][0]=new Option("Now Select This One"," ");
group[1][1]=new Option("JavaScript","47");
group[1][2]=new Option("DHTML","46");
group[1][3]=new Option("CGI","45");
group[2][0]=new Option("Now Select This One"," ");
group[2][1]=new Option("General News","115");
group[2][2]=new Option("Technology News","116");
var temp=document.isc.stage2
function redirect(x){
for (m=temp.options.length-1;m>0;m--)
temp.options[m]=null
for (I=0;I<group[x].length;I++){
temp.options[I]=new Option(group[x][I].text,group[x][I].value)
}
temp.options[0].selected=true
redirect1(0)
}
var secondGroups=document.isc.stage2.options.length
var secondGroup=new Array(groups)
for (I=0; I<groups; I++) {
secondGroup[I]=new Array(group[I].length)
for (j=0; j<group[I].length; j++) {
secondGroup[I][j]=new Array() }}
secondGroup[0][0][0]=new Option("---Select 3---"," ");
secondGroup[1][0][0]=new Option("---Select 3---"," ");
secondGroup[1][1][0]=new Option("Now Select This One"," ");
secondGroup[1][1][1]=new Option("Website Abstraction","http://wsabstract");
secondGroup[1][1][2]=new Option("JavaScript for the non programmer","http://webteacher/javascript/");
secondGroup[1][1][3]=new Option("Java-Scripts.net","http://www.phperz.com");
secondGroup[1][2][0]=new Option("Now Select This One"," ");
secondGroup[1][2][1]=new Option("Dynamic Drive","dynamicdrive");
secondGroup[1][2][2]=new Option("Beginner's Guide to DHTML","geocities/ResearchTriangle/Facility/4490/");
secondGroup[1][2][3]=new Option("Web Coder","http://sc.phperz.com/");
secondGroup[1][3][0]=new Option("Now Select This One"," ");
secondGroup[1][3][1]=new Option("CGI Resources","cgi-resources");
secondGroup[1][3][2]=new Option("Ada's Intro to CGI","http://play.phperz.com/");
secondGroup[2][0][0]=new Option("---Select 3---"," ");
secondGroup[2][1][0]=new Option("Now Select This One"," ");
secondGroup[2][1][1]=new Option("CNN","cnn");
secondGroup[2][1][2]=new Option("MSNBC","msnbc");
secondGroup[2][1][3]=new Option("ABC News","abcnews");
secondGroup[2][2][0]=new Option("Now Select A Page"," ");
secondGroup[2][2][1]=new Option("News","news");
secondGroup[2][2][2]=new Option("Wired","wired");
var temp1=document.isc.stage3
function redirect1(y){
for (m=temp1.options.length-1;m>0;m--)
temp1.options[m]=null
for (I=0;I<secondGroup[document.isc.example.options.selectedIndex][y].length;I++){
temp1.options[I]=new Option(secondGroup[document.isc.example.options.selectedIndex][y][I].text,secondGroup[document.isc.example.options.selectedIndex][y][I].value)
}
temp1.options[0].selected=true
}
function redirect2(z){
window.location=temp1[z].value
} //-->
</script>
</FORM>
</body>
</html></td>
</tr>
</table>