<button onclick="show()">show</button><button onclick="hide()">hide</button><script>//創建加載對象var obj = new loadingImg();//顯示加載圖片function show(){  obj.show();}//隱藏加載圖片function hide(){  obj.hide();}//加載圖片方法（對象）function loadingImg(mySetting){  var that = this;  if(mySetting == "" || mySetting == undefined || typeof mySetting != "object"){    mySetting = {};  }  //使用時間戳作為空間的ID  var targetID = new Date().getTime();  this.setting = {    //插入圖片的容器,使用jquery的查詢方式傳入參數    targetConater : "",    //使用圖片的地址    imgUrl : "../img/loading.gif",    //圖片顯示的 寬度    imgWidth : "32px",    //圖片的默認樣式    imgClass : "",    //生成控件的ID    "targetID" : targetID,    //顯示之前的回調函數    beforeShow : function(plugin){    },    //顯示之后的回調函數    afterShow : function(plugin,targetID){    }  }  this.setting = $.extend(this.setting, mySetting);  //獲取屏幕的寬度  this.getScreenWidth = function(){    return document.documentElement.clientWidth;  }  //獲取屏幕的高度  this.getScreenHeight = function (){    return document.documentElement.clientHeight;  }  //顯示控件  this.show = function(){    $("#" + that.setting.targetID).show();  }  //隱藏控件  this.hide = function(){    $("#" + that.setting.targetID).hide();  }  this.init = function(){    //顯示之前執行回調函數    if(typeof that.setting.beforeShow == "function"){      that.setting.beforeShow(that);    }    //存放字符串的變量    var targetHTML = '';    //將內容存放到指定的容器中，默認存放到body最底部    if(that.setting.targetConater != "" && this.setting.targetConater != undefined){      targetHTML = '<img src="' + that.setting.imgUrl + '" class="' + that.setting.imgClass + '" id="' + that.setting.targetID + '" style="display:none;">';      $(that.setting.targetConater).html(targetHTML);    }else{      targetHTML = '<img src="' + that.setting.imgUrl + '" class="' + that.setting.imgClass + '">';      targetHTML = '<div id="' + that.setting.targetID + '" style="display:none;position: absolute;top:50%;left: 50%;height: ' + that.getScreenHeight()+';width:'+that.getScreenWidth()+'">' + targetHTML + '</div>';      $("body").append(targetHTML);    }    //判斷用戶是否自定義了圖片的寬度    if(that.setting.imgWidth != "" && that.setting.imgWidth.indexOf("px")>0 ){      $("#"+targetID).css("width",that.setting.imgWidth);    }    //顯示之后執行回調函數    if(typeof that.setting.afterShow == "function"){      that.setting.afterShow(that,targetID);    }  }  this.init();}</script>