用正则表达式。。
查找fgh
<script language="javascript">
str="asdfghjkl"
var str="asdfghjkl"
var reg=/FGh/;
alert(reg.test(str));
</script>
查找fgh
<script language="javascript">
str="asdfghjkl"
var str="asdfghjkl"
var reg=/FGh/;
alert(reg.test(str));
</script>
var reg=/FGh/i;查找FGh
<script language="javascript">
str="asdfghjkl"
var str="asdfghjkl"
var reg=/FGh/i;
alert(reg.test(str));
</script>
存在;
} else {
不存在;
}