如何使用touchend for iOS Safari替换mouseout事件？

Question

从Safari docs文档来看，我应该能够向一个元素添加一个事件监听器，以便触发一个touchend事件（我假设这是用户举起时发生的事件他们的手指先触摸了元素。）

但是，我没有使用此代码获得所需的行为：

/* 

    Easy Scroll v1.0
    written by Alen Grakalic, provided by Css Globe (cssglobe.com)
    please visit http://cssglobe.com/post/1495/easy-scroll-accessible-content-scroller

*/

this.easyscroll = function(){

    // id of the container element 
    var id = "myContent";

    // navigation buttons text
    //dave var nav = ["Scroll Up", "Scroll Down", "Reset"];
    var nav = ["Scroll Up", "Scroll Down"];

    //  id for each navigation button (OPTIONAL)
    //dave var navId = ["btnUp", "btnDown", "btnReset"];
     var navId = ["btnUp", "btnDown"];

    // movement speed
    var speed = 10;

    // desired height of the container element (in pixels)
    var height = 300;

    //
    // END CONFIG
    // do not edit below this line (unless you want to of course :) )
    //

    var obj = document.getElementById(id);

    obj.up = false;
    obj.down = false;
    obj.fast = false;

    var container = document.createElement("div");
    var parent = obj.parentNode;
    container.id="easyscroll";
    parent.insertBefore(container,obj);
    parent.removeChild(obj);    

    container.style.position = "relative";
    container.style.height = height + "px";
    container.style.overflow = "hidden";
    obj.style.position = "absolute";
    obj.style.top = "0";
    obj.style.left = "0";
    container.appendChild(obj);

    var btns = new Array();
    var ul = document.createElement("ul");
    ul.id="easyscrollnav";
    for (var i=0;i<nav.length;i++){
        var li = document.createElement("li");
        li.innerHTML = nav[i];
        li.id = navId[i];
        btns.push(li);
        ul.appendChild(li);
    }

    parent.insertBefore(ul,container);

    btns[0].onmouseover = function(){
        obj.up = true;
        this.className = "over";
    };
    btns[0].onmouseout = function(){
        obj.up = false;
        this.className = "";
    };      
    btns[1].onmouseover = function(){
        obj.down = true;
        this.className = "over";        
    };
    btns[1].onmouseout = function(){
        obj.down = false;
        this.className = "";
    };      
    btns[0].onmousedown = btns[1].onmousedown = function(){
        obj.fast = true;
    };  
    btns[0].onmouseup = btns[1].onmouseup = function(){
        obj.fast = false;
    };


    btns[0].addEventListener("touchend", function(){
        obj.up = false;
    }, false);
    btns[1].addEventListener("touchend", function(){
        obj.down = false;
    }, false);

    //btns[2].onmouseover = function(){         
    //  this.className = "over";
//  };  
    //btns[2].onmouseout = function(){      
        //this.className = "";
    //};        
    //btns[2].onclick = function(){         
    //  obj.style.top = "0px";
//  };      

    this.start = function(){                
        var newTop;
        var objHeight = obj.offsetHeight;
        var top = obj.offsetTop;
        var fast = (obj.fast) ? 2 : 1;
        if(obj.down){        
            newTop = ((objHeight+top) > height) ? top-(speed*fast) : top;   
            obj.style.top = newTop + "px";
        };  
        if(obj.up){      
            newTop = (top < 0) ? top+(speed*fast) : top;
            obj.style.top = newTop + "px";
        };
    };  
    obj.interval = setInterval("start()",50);       

};


//
// script initiates on page load. 
//

this.addEvent = function(obj,type,fn){
    if(obj.attachEvent){
        obj['e'+type+fn] = fn;
        obj[type+fn] = function(){obj['e'+type+fn](window.event );}
        obj.attachEvent('on'+type, obj[type+fn]);
    } else {
        obj.addEventListener(type,fn,false);
    };
};
addEvent(window,"load",easyscroll);

在iOS上的Safari中，我必须再次单击btn [0]和btn 1才能停止滚动。期望的行为是，一旦用户移开他们的手指就滚动停止，在第一次触摸时开始滚动。 easyscroll库是专为桌面浏览器设计的，我也试图让它适应iOS上的工作。

如果没有修改，就无法停止在触摸设备上滚动。