js 擷取表單寬度和高度 JavaScript

 

<script type="text/javascript">$(document).ready(function(){var winWidth = 0;var winHeight = 0;findDimensions();function findDimensions() // 函數：擷取尺寸{// 擷取視窗寬度if (window.innerWidth)winWidth = window.innerWidth;else if ((document.body) && (document.body.clientWidth))winWidth = document.body.clientWidth;// 擷取視窗高度if (window.innerHeight)winHeight = window.innerHeight;else if ((document.body) && (document.body.clientHeight))winHeight = document.body.clientHeight;// 通過深入 Document 內部對 body 進行檢測，擷取視窗大小if (document.documentElement && document.documentElement.clientHeight && document.documentElement.clientWidth){winHeight = document.documentElement.clientHeight;winWidth = document.documentElement.clientWidth;}}$("form").before('<div style="height: '+winHeight*0.2+'px"></div>');});</script>