左键标示，IE里面是1，Google里面是0，右键都是2.
判断为左键，0或1都是
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<span id="t-p" οnmοusedοwn="whichButtonDown(event)" οnmοuseup="whichButtonUp(event)" οnmοusemοve="LeftButtonMove()">您好，欢迎登陆英才库招聘网</span>
<input id="OptType" name="OptType" type="text" value="-1">
<script language="javascript" type="text/javascript">
//鼠标左键按下 OptType=2
//鼠标左键抬起 OptType=3
function LeftButtonUp()
{
document.getElementById("OptType").value = "up";
//window.close();
}
function whichButtonDown(event)
{
var btnNum = event.button;
document.getElementById("OptType").value = "down" + btnNum;
}
function whichButtonUp(event)
{
var btnNum = event.button;
document.getElementById("OptType").value = "up" + btnNum;
}
//鼠标左键移动 OptType=4
function LeftButtonMove()
{
//document.getElementById("OptType").value = "4";
//window.close();
}
</script>