自定义ALERT样式

转帖： http://hi.baidu.com/occn/blog/item/9601a2869fc35c3c66096efb.html

自定义ALERT的样式，可以拖动。

在HTML加上 alert.js内容 window.alert = function(txt) {      var shield = document.createElement("DIV");      shield.id = "shield";      shield.style.position = "absolute";      shield.style.left = "0px";      shield.style.top = "0px";      shield.style.width = "1003px";      shield.style.height = document.body.scrollHeight+"px";      //shield.style.background = "#000000";      shield.style.textAlign = "center";      shield.style.zIndex = "10000";      //shield.style.filter = "alpha(opacity=6)";      var alertFram = document.createElement("DIV");      alertFram.id="alertFram";      alertFram.style.position = "absolute";      alertFram.style.zIndex = "10001"; alertFram.style.left="310px"; alertFram.style.top="170px"; strHtml="" strHtml+=' ' strHtml+='' strHtml+='   ' strHtml+='     ' strHtml+='     ' strHtml+='     ' strHtml+='     ' strHtml+='   ' strHtml+='   ' strHtml+='     ' strHtml+='     ' strHtml+='     ' strHtml+='   ' strHtml+='   ' strHtml+='     ' strHtml+='     ' strHtml+='     ' strHtml+='   ' strHtml+=' 中国DJ171音乐娱乐网 WWW.DMC.CN ' strHtml+=' ' strHtml+=' '+txt+' ' strHtml+=' ' alertFram.innerHTML = strHtml;      document.body.appendChild(alertFram);      document.body.appendChild(shield);      var c = 0;      this.doAlpha = function(){          if (c++ > 20){clearInterval(ad);return 0;}          shield.style.filter = "alpha(opacity="+c+");";      } this.remove=function(){      alertFram.innerHTML="";    shield.style.filter = "";    shield.id = "";    shield.style.position = "";    shield.style.left = "";    shield.style.top = "";    shield.style.width = "";    shield.style.height ="";    shield.style.background = "";    shield.style.textAlign = "";    shield.style.zIndex = "";    shield.style.filter = "";    alertFram.id="";    alertFram.style.position = "";    alertFram.style.left = "";    alertFram.style.top = "";    alertFram.style.marginLeft = "";    alertFram.style.marginTop = "";    alertFram.style.width = "";    alertFram.style.height = "";    alertFram.style.background = "";    alertFram.style.textAlign = "";    alertFram.style.lineHeight = "";    alertFram.style.zIndex = "";    document.body.onselectstart = function(){return true;}; } var ad = setInterval("doAlpha()",5);      alertFram.focus();      document.body.onselectstart = function(){return false;}; } var object = null; var newobject = null; var element = null; var moveX, moveY; document.onmousemove = mousemove; document.onmouseup = mouseup; /* 鼠标托动 */ function mousedown(para) { object = document.getElementById(para); moveX = object.style.pixelLeft - event.clientX; moveY = object.style.pixelTop - event.clientY; } /* 开始托动 */ function mousemove() {      if(object != null){    object.style.left = moveX + event.clientX;    object.style.top = moveY + event.clientY;    event.returnValue = false;      } } /* 释放对象 */ function mouseup() { if(object != null){    object = null; } if(newobject != null){    newobject = null; } } /* 改变大小 */ function cursordown(para) { newobject = document.getElementById(para); } /* 开始改变 */ function cursormove() { var xMinWidth = 10, xMinHeight = 30; var xWidth = 0, xHeight = 0; if(newobject != null){    xWidth = Math.max(xMinWidth, event.clientX - newobject.style.left.replace('px',''));    xHeight = Math.max(xMinHeight, event.clientY - newobject.style.top.replace('px',''));    newobject.style.width = xWidth + xMinWidth + 'px';    newobject.style.height = xHeight - xMinHeight + 'px';    event.returnValue = false;