js Touch事件（向左滑动，后退）

js Touch事件（向左滑动，后退）

代码如下

var touch_p = {
            c_x : 0,
            c_y : 0,
            hasbacked : false
        };
function touches(ev){
    if(ev.touches.length==1){
        switch(ev.type){
            case 'touchstart':
                if(console)
                    console.log('Touch start('+ev.touches[0].clientX+', '+ev.touches[0].clientY+')');
                touch_p.c_x = ev.touches[0].clientX;
                touch_p.c_y = ev.touches[0].clientY;
                ev.preventDefault();
                break;
            case 'touchend'://未成功触发，未找到原因
                //oDiv.innerHTML='Touch end('+ev.changedTouches[0].clientX+', '+ev.changedTouches[0].clientY+')';
                if(console)
                    console.log('Touch end('+ev.changedTouches[0].clientX+', '+ev.changedTouches[0].clientY+')');
                break;
            case 'touchmove':
                var tempX = ev.changedTouches[0].clientX;
                var tempY = ev.changedTouches[0].clientY;
                var diff_x = tempX - touch_p.c_x;
                var diff_y = Math.abs(tempY - touch_p.c_y);
                /*console.log('Touch move('+ev.changedTouches[0].clientX+', '+ev.changedTouches[0].clientY+')<br>diff_x=' + diff_x
                 + "<br>diff_y=" + diff_y);*/
                //x轴方向移动超过150 纵轴方向移动小于30
                if(!touch_p.hasbacked && diff_x > 150 && diff_y < 30){
                    goback();
                }
                break;

        }
    }
}
document.addEventListener('touchstart',touches,false);
document.addEventListener('touchend',touches,false);
document.addEventListener('touchmove',touches,false);
function goback() {
    if(console)
        console.log("go back");
    touch_p.hasbacked = true;
    window.history.back();
}