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1.居中弹出层 #prompt_center_div{ border:1px solid gray; position:fixed; background: #f2f2f2; top: 50%; left: 50%; padding:5px; /* opacity:0.1; -moz-opacity:0.1; filter:alpha(opacity=10); */ } <!-- 弹出层 --> <div id="prompt_center_div"> 姓名:小小明<br/> 电话:<input type="text" value="" name="" id=""/> </div> 2.获得屏幕中心对象获得屏幕中心对象 function getPosition() { var top,left,height,width,h,w; if(document.compatMode && document.compatMode!="BackCompat"){ top = document.documentElement.scrollTop; left = document.documentElement.scrollLeft; height = document.documentElement.clientHeight; width = document.documentElement.clientWidth; h = document.documentElement.scrollHeight; w = document.documentElement.scrollWidth; }else{ top = document.body.scrollTop; left = document.body.scrollLeft; height = document.body.clientHeight; width = document.body.clientWidth; h = document.body.scrollHeight; w = document.body.scrollWidth; } if(h<height){ h = height; w = width; } // alert(height + '---------' + h + '---------' + width + '-----------' + w); return {top:top,left:left,height:height,width:width,h:h,w:w,sw:window.screen.width,sh:window.screen.height}; } function getCenter() { var pos = getPosition(); return {left:pos.left+pos.width/2,top:pos.top+pos.height/2,height:pos.height,width:pos.width,h:pos.h,w:pos.w,sw:pos.sw,sh:pos.sh}; }