<script language="JavaScript">
<!--
var str = "4||23||56||-1";
alert(str.split("||")[0]);
//-->
</script>或者
<script language="JavaScript">
<!--
var str = "4||23||56||-1";
alert(str.substring(0,1));
//-->
</script>
<!--
var str = "4||23||56||-1";
alert(str.split("||")[0]);
//-->
</script>或者
<script language="JavaScript">
<!--
var str = "4||23||56||-1";
alert(str.substring(0,1));
//-->
</script>
<!--
var str= "4||23||56||-1"
var s = str.charAt(0); /*or var s = str.substr(0,1);*/
window.alert(s);
//-->
</script>
<!--
var str= "4||23||26||-1";for(var i=0; i<str.length; i++)
{
var s = str.charAt(i); if(s == "2") /*or "3" or "4" or "5"*/
window.alert(s + " 在第 " + (i+1) + " 个位置!");
}
//-->
</script>