根据鼠标位置和弹出页面大小，控制windows.open位置
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>获取鼠标坐标</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><style type="text/css">.tip {width:200px;border:2px solid #ddd;padding:8px;background:#f1f1f1;color:#666;}</style><script type="text/javascript"> function mousePos(e){var x,y,z,i;var e = e||window.event;return {x:e.clientX+document.body.scrollLeft+document.documentElement.scrollLeft,y:e.clientY+document.body.scrollTop+document.documentElement.scrollTop,z:document.documentElement.clientWidth,i:document.documentElement.clientHeight};};function test(e){document.getElementById("mjs").innerHTML = mousePos(e).x+','+mousePos(e).y+','+mousePos(e).z+','+mousePos(e).i; };function heitest(e){var mouseX=e.clientX;varmouseY=e.clientY;varbodyX=document.documentElement.clientWidth;varbodyY=document.documentElement.clientHeight/2;var newX=bodyX-780;var newY=mouseY+110;if(mouseY<bodyY){newY=mouseY+110;}else{newY=mouseY-80;}if((bodyX-mouseX)>780){newX=mouseX;}else{newX=bodyX-780;}window.open('about:blank','newwindow','height=160,width=780,top='+newY+',left='+newX);};</script></head><body onmousemove="test(event)" onclick="heitest(event)"><div id="mjs" style="width:500px;height:1000px;background:#ccc;" ></div></body></html>