本篇文章为大家展示了Javascript中indexOf函数如何使用，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

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使用方法：strObj.indexOf(str,startIndex[可选])

程序代码

其中strObj是必选项。String 对象或文字。
str是必选项。要在 String 对象中查找的子字符串。
startIndex是可选项。该整数值指出在 String 对象内开始查找的位置，从0开始。如果省略，则从字符串的开始处查找。

注意：对于JavaScript indexOf是区分大小写的。

JavaScript中indexOf函数方法返回一个整数值，指出 String 对象内子字符串的开始位置。如果没有找到字符串，则返回 -1。如果 startindex 是负数，则 startindex 被当作零。如果它比***的字符位置索引还大，则它被当作***的可能索引。

javascript indexOf函数是从左向右执行查找

下面的示例说明了indexOf函数方法的用法。

程序代码

var str1="fdiejDIFADF";   var str="e";   var i=str1.indexOf(str);   alert(i);

在前面说了，indexOf是区分大小的写，有时这就给我们造成了一定的麻烦，那怎么解决呢？？当然最简单的方法是把字符用toLowerCase或toUpperCase转化为大写或小写就解决了。
代码如下：
程序代码

	    基本
        文件
        流程
        错误
        SQL
        调试
    

		    

    

	
请求信息 : 2026-06-04 22:22:11 HTTP/1.1 GET : /article/gjhpio.html
运行时间 : 1.3775s ( Load:0.0066s Init:0.7245s Exec:0.6372s Template:0.0093s )
吞吐率 : 0.73req/s
内存开销 : 2,225.55 kb
查询信息 : 12 queries 5 writes 
文件加载 : 36
缓存信息 : 0 gets 0 writes 
配置加载 : 130
会话信息 : SESSION_ID=lt70tipimrlp79q0c1obh6ulv2
    
    
        

    

	
/www/wwwroot/tsicrk.com/index.php ( 1.09 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/ThinkPHP.php ( 4.61 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Mode/common.php ( 2.82 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Common/functions.php ( 53.56 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.91 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Conf/convention.php ( 11.15 KB )
/www/wwwroot/tsicrk.com/App/Common/Conf/config.php ( 2.14 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Lang/zh-cn.php ( 2.55 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Conf/debug.php ( 1.49 KB )
/www/wwwroot/tsicrk.com/App/Home/Conf/config.php ( 0.31 KB )
/www/wwwroot/tsicrk.com/App/Home/Common/function.php ( 3.33 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )
/www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php ( 6.02 KB )
/www/wwwroot/tsicrk.com/App/Home/Controller/CommController.class.php ( 1.60 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )
/www/wwwroot/tsicrk.com/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 17.71 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )
/www/wwwroot/tsicrk.com/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )
    
    
        

    

	
[ app_init ] --START--
Run Behavior\BuildLiteBehavior [ RunTime:0.000006s ]
[ app_init ] --END-- [ RunTime:0.000036s ]
[ app_begin ] --START--
Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000305s ]
[ app_begin ] --END-- [ RunTime:0.000329s ]
[ view_parse ] --START--
[ template_filter ] --START--
Run Behavior\ContentReplaceBehavior [ RunTime:0.000062s ]
[ template_filter ] --END-- [ RunTime:0.000081s ]
Run Behavior\ParseTemplateBehavior [ RunTime:0.006398s ]
[ view_parse ] --END-- [ RunTime:0.006425s ]
[ view_filter ] --START--
Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000156s ]
[ view_filter ] --END-- [ RunTime:0.000170s ]
[ app_end ] --START--
    
    
        

    

	
1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1  
1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1  
1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) 
[8] Undefined index: pid /www/wwwroot/tsicrk.com/App/Home/Controller/ArticleController.class.php 第 47 行.
[8] Undefined index: db_host /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 120 行.
[8] Undefined index: db_port /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 121 行.
[8] Undefined index: db_name /www/wwwroot/tsicrk.com/ThinkPHP/Library/Think/Db.class.php 第 122 行.
    
    
        

    

	    
    
        

    

	    
    
    



1.3775s