用split
<SCRIPT LANGUAGE="JavaScript">
<!--
var str="北京-/news/deatil.php?no=153300";
var array=str.split("-");
alert(array[0]);//查看
//-->
</SCRIPT>
<SCRIPT LANGUAGE="JavaScript">
<!--
var str="北京-/news/deatil.php?no=153300";
var array=str.split("-");
alert(array[0]);//查看
//-->
</SCRIPT>
var a = "北京-/news/deatil.php?no=153300";
var b = a.substring(0, a.indexOf('-'));
alert(b);
</SCRIPT>