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I would like to be a friend of the Web page is not too unfamiliar with this property function-we can find it from a number of JavaScript reference books: Thestring.indexof (Substring,[n]). It looks for a routed substring in the specified string object, and if you specify parameter n, it can start the search forward (from left to right) from the specified position. If a substring is found, this method returns the position of the substring in the string, and returns 1 if no corresponding string is found.
Using this property, we can call it a lot of work, as long as you command it properly.
I. Judging OS
In general, judging your visitors ' operating system will make them think you're done, but not always. Although the HTTP protocol is cross-platform, the final display of HTML pages you write is often related to the operating system used by the client. For example, the MSOs series (Ms-dos,windows 9x/nt, etc.) for the text "another line" is defined as "carriage return add line", but the Mac as long as a "return" is enough, and Unix/linux only use "line break". So you can export some of the things you want to branch in a certain page, which may result in a "compatibility" problem ... Never mind, look at the following example.
First step. Insert the following script at a location in the page:
<script language="JavaScript"><!--
var newline=''; //定义"另起一行"的全局变量
var browserVer=navigator.appVersion;
if(browserVer.indexOf('Win')!=-1){ //如果当前浏览器的版本是Windows版的
newline='
';}
else{
if(browserVer.indexOf('Mac')!=-1){ //如果当前浏览器的版本是Mac版的
newline='
';}
else{ //那因该就是Linux版的了
newline='
';}
}
-->
</script>
Second step. Use it in the page body (<body>......</body>):
<script language="JavaScript"><!--
var win=self.window;
win.alert('第一行'+newline+'第二行'+newline+'第三行'); //可以将newline作为一个变量在任意位置引用
-->
</script>
Two. Judge the browser
The 1998 browser war seems to have vanished, but the resulting browser compatibility problem has been a huge pain to the vast number of web writers. There are a number of solutions to this problem, which are beyond the scope of this article, but I think the most thorough and effective approach is probably to write a page version for each major browser, which is almost perfect. Try the following code, which will help you bring your visitors to the page that corresponds to the client browser:
<!-- 把这段代码放在页面的前部，最好放在<script language="JavaScript"><!--
var browser=navigator.appName;
var version=navigator.appVersion;
var ver_number=parseFloat(version.substring(0,version.indexOf('(')));
//如果客户端浏览器是ie并且版本高于4.0
if(browser.indexOf('Microsoft Internet Explorer')!=-1&&ver_number>=4.0) top.location='/ie4/index.html' //假设你为4.0及更高版本的ie准备的页面是/ie4/index.html
//如果客户端浏览器是Netscape并且版本高于4.0
else if(browser.indexOf('Netscape')!=-1&&ver_number>=4.0) top.location='/nc4/index.html' //假设你为Netscape 4.X准备的页面是/nc4/index.html
else top.location='/normal/index.html' //假设你为其他浏览器及低版本的NC、IE准备的页面是/normal/index.html
-->
</script>
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