JavaScript 点击页面上的按纽，弹出层，背景变灰_javascript技巧

bgObj.setAttribute( 'id ', 'bgDiv '); bgObj.style.position="absolute"; bgObj.style.top= "0"; bgObj.style.background= "#777 "; bgObj.style.filter= "progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75 "; bgObj.style.opacity= "0.6"; bgObj.style.left= "0"; bgObj.style.width=sWidth + "px"; bgObj.style.height=sHeight + "px"; bgObj.style.zIndex = "10000"; document.body.appendChild(bgObj);//在body内添加该div对象 var msgObj=document.createElement( "div")//创建一个div对象（提示框层） //定义div属性，即相当于 // msgObj.setAttribute( "id", "msgDiv"); msgObj.setAttribute( "align", "center"); msgObj.style.background= "white "; msgObj.style.border= "1px solid " ; msgObj.style.position = "absolute"; msgObj.style.left = "50%"; msgObj.style.top = "50%"; msgObj.style.font= "12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif"; msgObj.style.marginLeft = "-225px" ; msgObj.style.marginTop = -75+document.documentElement.scrollTop+ "px"; msgObj.style.width = msgw + "px"; msgObj.style.height =msgh + "px"; msgObj.style.textAlign = "center"; msgObj.style.lineHeight = "25px"; msgObj.style.zIndex = "10001"; var title=document.createElement( "h4");//创建一个h4对象（提示框标题栏） //定义h4的属性，即相当于 //

关闭

title.setAttribute( "id", "msgTitle"); title.setAttribute( "align", "right"); title.style.margin= "0"; title.style.padding= "3px"; title.style.background=bordercolor; title.style.filter= "progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);"; title.style.opacity= "0.75 "; title.style.border= "1px solid" ; title.style.height= "18px "; title.style.font= "12px Verdana, Geneva, Arial, Helvetica, sans-serif"; title.style.color= "white"; title.style.cursor= "pointer"; title.innerHTML= "关闭"; title.onclick=removeObj; var button=document.createElement( "input");//创建一个input对象（提示框按钮） //定义input的属性，即相当于 // button.setAttribute( "type", "button"); button.setAttribute( "value", "关闭"); button.style.width= "60px"; button.style.align= "center"; button.style.marginLeft= "250px"; button.style.marginBottom= "10px"; button.style.background=bordercolor; button.style.border= "1px solid"; button.style.color= "white"; button.onclick=removeObj; function removeObj() {//点击标题栏触发的事件 document.body.removeChild(bgObj);//删除背景层Div document.getElementById( "msgDiv").removeChild(title);//删除提示框的标题栏 document.body.removeChild(msgObj);//删除提示框层 } document.body.appendChild(msgObj);//在body内添加提示框div对象msgObj document.getElementById( "msgDiv").appendChild(title);//在提示框div中添加标题栏对象title var txt=document.createElement( "p");//创建一个p对象（提示框提示信息） //定义p的属性，即相当于 //

测试效果

txt.style.margin= "1em 0" txt.setAttribute( "id ", "msgTxt"); txt.innerHTML=str;//来源于函数调用时的参数值 document.getElementById( "msgDiv").appendChild(txt);//在提示框div中添加提示信息对象txt document.getElementById( "msgDiv").appendChild(button);//在提示框div中添加按钮对象button }
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]
注意style.position和style.zIndex两属性。