关于javascript:h5滑动不触发点击事件

function tap(el,fn){    var startPoint = {};    el.addEventListener('touchstart', function(e) {        startPoint = {            x: e.changedTouches[0].pageX,            y: e.changedTouches[0].pageY        };    });    el.addEventListener('touchend', function(e) {        var nowPoint = {            x: e.changedTouches[0].pageX,            y: e.changedTouches[0].pageY        };        if(Math.abs(nowPoint.x - startPoint.x) < 5            &&Math.abs(nowPoint.y - startPoint.y) < 5) {            fn&&fn.call(el,e)        }    });}