javascript點選彈出可以關閉帶有灰色背景彈出層

antzone發表於2017-04-08
JavaScript

本章節分享一段程式碼例項，它實現了點選彈出一個帶有灰色背景的彈出層效果。

並且此層帶有關閉按鈕，由於程式碼比較長且比較簡單，所以這裡就不做分析了，需要的自行參考一下。

程式碼例項如下:

[HTML] 純文字檢視 複製程式碼
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>螞蟻部落</title>
<script>
function alertWin(title, msg, w, h){ 
  var titleheight = "23px"; // 視窗標題高度 
  var bordercolor = "#336699"; // 提示視窗的邊框顏色 
  var titlecolor = "#FFFFFF"; // 視窗標題顏色 
  var titlebgcolor = "#336699"; // 視窗標題背景色
  var bgcolor = "#FFFFFF"; // 提示內容的背景色
  var iWidth = document.documentElement.clientWidth; 
  var iHeight = document.documentElement.clientHeight; 
  var bgObj = document.createElement("div"); 
  bgObj.style.cssText = "position:absolute;left:0px;top:0px;width:"+iWidth
  +"px;height:"+Math.max(document.body.clientHeight, iHeight)
  +"px;filter:Alpha(Opacity=30);opacity:0.3;background-color:#000000;z-index:101;";
  document.body.appendChild(bgObj); 
  var msgObj=document.createElement("div");
  msgObj.style.cssText = "position:absolute;font:11px '宋體';top:"
  +(iHeight-h)/2+"px;left:"+(iWidth-w)/2+"px;width:"
  +w+"px;height:"+h+"px;text-align:center;border:1px solid "
  +bordercolor+";background-color:"
  +bgcolor+";padding:1px;line-height:22px;z-index:102;";
  document.body.appendChild(msgObj);
  var table = document.createElement("table");
  msgObj.appendChild(table);
  table.style.cssText = "margin:0px;border:0px;padding:0px;";
  table.cellSpacing = 0;
  var tr = table.insertRow(-1);
  var titleBar = tr.insertCell(-1);
  titleBar.style.cssText = "width:100%;height:"
  +titleheight+"px;text-align:left;padding:3px;margin:0px;font:bold 13px '宋體';color:"
  +titlecolor+";border:1px solid " + bordercolor + ";cursor:move;background-color:" + titlebgcolor;
  titleBar.style.paddingLeft = "10px";
  titleBar.innerHTML = title;
  var moveX = 0;
  var moveY = 0;
  var moveTop = 0;
  var moveLeft = 0;
  var moveable = false;
  var docMouseMoveEvent = document.onmousemove;
  var docMouseUpEvent = document.onmouseup;
  titleBar.onmousedown = function() {
    var evt = getEvent();
    moveable = true; 
    moveX = evt.clientX;
    moveY = evt.clientY;
    moveTop = parseInt(msgObj.style.top);
    moveLeft = parseInt(msgObj.style.left);  
    document.onmousemove = function() {
      if(moveable){
        var evt = getEvent();
        var x = moveLeft + evt.clientX - moveX;
        var y = moveTop + evt.clientY - moveY;
        if( x > 0 &&( x + w < iWidth) && y > 0 && (y + h < iHeight)){
          msgObj.style.left = x + "px";
          msgObj.style.top = y + "px";
        }
      } 
    };
    document.onmouseup=function(){ 
      if(moveable){ 
        document.onmousemove = docMouseMoveEvent;
        document.onmouseup = docMouseUpEvent;
        moveable = false; 
        moveX = 0;
        moveY = 0;
        moveTop = 0;
        moveLeft = 0;
      } 
    };
  }
  var closeBtn = tr.insertCell(-1);
  closeBtn.style.cssText = "cursor:pointer; padding:2px;background-color:" + titlebgcolor;
  closeBtn.innerHTML = "<span style='font-size:15pt; color:"+titlecolor+";'>×</span>";
  closeBtn.onclick = function(){ 
    document.body.removeChild(bgObj); 
    document.body.removeChild(msgObj); 
  } 
  var msgBox = table.insertRow(-1).insertCell(-1);
  msgBox.style.cssText = "font:10pt '宋體';";
  msgBox.colSpan = 2;
  msgBox.innerHTML = msg;
  // 獲得Event物件，用於相容IE和FireFox
  function getEvent() {
    return window.event || arguments.callee.caller.arguments[0];
  }
} 
window.onload=function(){
  var obt=document.getElementById("bt");
  obt.onclick=function(){
    alertWin('點選彈出可關閉的層視窗，網頁變灰',290,208);
  }
}
</script>
</head>
<body>
<input type="button" id="bt" value="點這裡"/>
</body>
</html>

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