javascript 字符串的contains 函数

/* * *string:原始字符串 *substr:子字符串 *isIgnoreCase:忽略大小写 function contains(string,substr,isIgnoreCase) {     if(isIgnoreCase)     {      string=string.toLowerCase();      substr=substr.toLowerCase();     }      var startChar=substr.substring(0,1);      var strLen=substr.length;          for(var j=0;j<string.length-strLen+1;j++)          {              if(string.charAt(j)==startChar)//如果匹配起始字符,开始查找              {                    if(string.substring(j,j+strLen)==substr)//如果从j开始的字符与str匹配，那ok                    {                          return true;                    }                }          }          return false; }

转载于:https://www.cnblogs.com/qiantuwuliang/archive/2009/04/29/1445857.html