编写可维护的JavaScript

var myApp = {
    handleClick: function(e){
      this.showPopup(e);  
    },
    showPopup: function(e){
        var popup = document.getElementById("popup");
        popup.style.left = e.clientX + "px";
        popup.style.top = e.clientY + "px";
    }
};

addEventListener(element,"click",function(e){
    MyApp.handleClick(e);
});

var myApp = {
    handleClick: function(e){
     // 假设事件支持 DOMlevel2
     
     e.preventDefault();
     e.stopPropagation();
     
     //传入应用逻辑
      this.showPopup(e.clientX,e.clientY);  
    },
    showPopup: function(x,y){
        var popup = document.getElementById("popup");
        popup.style.left = x + "px";
        popup.style.top = y + "px";
    }
};

addEventListener(element,"click",function(e){
    MyApp.handleClick(e);
});