<SCRIPT LANGUAGE="JavaScript">
<!--
var test="happybrithday_1";
num=test.indexOf('_');
alert("study"+test.substr(num));
//-->
</SCRIPT>
<!--
var test="happybrithday_1";
num=test.indexOf('_');
alert("study"+test.substr(num));
//-->
</SCRIPT>
调试欢乐多
var b1 = "happybrithday"
var b2 = "study"
a = a.replace( b1 , b2 )