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();

}