让DIV在弹出位置在屏幕中间

来源：互联网发布：汶川地震豆腐渣知乎编辑：程序博客网时间：2024/05/16 11:37
<HTML> <HEAD> <TITLE> 当前位置 </TITLE> <script> function show(){ // 仅适用于IE,clientWidth,clientHeight,分别指宽度和高度,以px计// scrollLeft.返回第一个匹配元素的水平滚动条位置var screenWidth = document.body.clientWidth+document.body.scrollLeft; var screenHeight = document.body.clientHeight; var divObj = document.getElementById("mydiv"); // 返回元素的宽度和高度,以px计var divWidth = divObj.offsetWidth; var divHeight = divObj.offsetHeight; // 这里是让div的位置位于当前屏幕的中间位置,这里的当前屏幕指的是不带滚动条的var left = parseInt((screenWidth - divWidth)/2); var top = parseInt((screenHeight - divHeight)/2); // 带上滚动条的位置进行计算divObj.style.left = left+document.body.scrollLeft; // scrollTop 滚动条的垂直位置divObj.style.top = top + document.body.scrollTop; } </script> </HEAD> <BODY> <input type="button" onclick="show()" value="show"></br> <div id="mydiv" style="border:1px solid #A2C5ED;position:absolute;display:block;background-color:red;height:100px;width:100px;">mydiv</div> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> <input type="button" onclick="show()" value="show"> </br>aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br><input type="button" onclick="show()" value="show"> </br>aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br>aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br> aaaaaaaaaaaaaaa<br></BODY> </HTML>