//解决ios双击页面上移问题
//在项目中测试不紧input/button这些表单控件有这个问题，p,p等也有问题，于是乎就直接在body开刀了
(function()
{
    var agent = navigator.userAgent.toLowerCase();        //检测是否是ios
    var iLastTouch = null;                                //缓存上一次tap的时间
    if (agent.indexOf('iphone') >= 0 || agent.indexOf('ipad') >= 0)
    {
        document.body.addEventListener('touchend', function(event)
        {
            var iNow = new Date()
                .getTime();
            iLastTouch = iLastTouch || iNow + 1 /** 第一次时将iLastTouch设为当前时间+1 */ ;
            var delta = iNow - iLastTouch;
            if (delta < 500 && delta > 0)
            {
                event.preventDefault();
                return false;
            }
            iLastTouch = iNow;
        }, false);
    }

})();

//下面是国外coder给的解决方案
//http://appcropolis.com/blog/howto/implementing-doubletap-on-iphones-and-ipads
(function($){
    // Determine if we on iPhone or iPad
    var isiOS = false;
    var agent = navigator.userAgent.toLowerCase();
    if(agent.indexOf('iphone') >= 0 || agent.indexOf('ipad') >= 0){
           isiOS = true;
    }
 
    $.fn.doubletap = function(onDoubleTapCallback, onTapCallback, delay){
        var eventName, action;
        delay = delay == null? 500 : delay;
        eventName = isiOS == true? 'touchend' : 'click';
 
        $(this).bind(eventName, function(event){
            var now = new Date().getTime();
            var lastTouch = $(this).data('lastTouch') || now + 1 /** the first time this will make delta a negative number */;
            var delta = now - lastTouch;
            clearTimeout(action);
            if(delta<500 && delta>0){
                if(onDoubleTapCallback != null && typeof onDoubleTapCallback == 'function'){
                    onDoubleTapCallback(event);
                }
            }else{
                $(this).data('lastTouch', now);
                action = setTimeout(function(evt){
                    if(onTapCallback != null && typeof onTapCallback == 'function'){
                        onTapCallback(evt);
                    }
                    clearTimeout(action);   // clear the timeout
                }, delay, [event]);
            }
            $(this).data('lastTouch', now);
        });
    };
})(Zepto);

//usage:
$(selector).doubletap(
    /** doubletap-dblclick callback */
    function(event){
        alert('double-tap');
    },
    /** touch-click callback (touch) */
    function(event){
        alert('single-tap');
    },
    /** doubletap-dblclick delay (default is 500 ms) */
);
//下面是国外coder给的解决方案--end
//解决ios双击网面上移问题--end