同事写的一个js遮罩
/** * 遮罩 * 用法：objTools.loading(); * 关闭:$("#wbox_cover").remove(); * 注意：z-dindex:1000 设定可能造成全覆盖 */objTools = {setPositionToCenter: function(node){node.style.position = "absolute";node.style.top = (objTools.getHeight() - node.offsetHeight) /2 + objTools.getTop() + "px";node.style.left = (objTools.getWidth() - node.offsetWidth) / 2 + "px";},getScrollHeight: function(){ return Math.max(document.documentElement.scrollHeight,document.body.scrollHeight);},getWidth: function(){var width=0;if(document.documentElement && document.documentElement.clientWidth){width=document.documentElement.clientWidth;}else if(document.body && document.body.clientWidth){width=document.body.clientWidth;}else if(window.innerWidth){width=window.innerWidth-18;}return width;},getHeight: function(){ var height=0; if(window.innerHeight) { height=window.innerHeight-18; } else if(document.documentElement && document.documentElement.clientHeight) { height=document.documentElement.clientHeight; } else if(document.body && document.body.clientHeight) { height=document.body.clientHeight; } return height;},getTop: function(){ var scrollY=0; if(document.documentElement && document.documentElement.scrollTop) { scrollY=document.documentElement.scrollTop; } else if(document.body && document.body.scrollTop) { scrollY=document.body.scrollTop; } else if(window.pageYOffset) { scrollY=window.pageYOffset; } else if(window.scrollY) { scrollY=window.scrollY; } return scrollY;},getLen: function(str){var len = 0;for (var i=0; i<str.length; i++) { if (str.charCodeAt(i) > 127) len += 2; else len++;}return len;},loading: function(){var elemCover = document.createElement("div");elemCover.id = "wbox_cover";elemCover.style.position = "absolute";elemCover.style.backgroundColor = "#000";elemCover.style.opacity = "0.3";elemCover.style.filter = "alpha(opacity=30)";elemCover.style.top = 0;elemCover.style.left = 0;elemCover.style.width = "100%";elemCover.style.zIndex = 1000;elemCover.style.height = objTools.getScrollHeight() + "px";document.body.appendChild(elemCover);}};?