移动端滑动方向判断

function touches(obj,direction,fun){
//obj:ID对象
//direction:swipeleft,swiperight,swipetop,swipedown,singleTap,touchstart,touchmove,touchend
//          划左，    划右，     划上，   划下，    点击，    开始触摸， 触摸移动， 触摸结束
//fun:回调函数
var defaults = {x: 5,y: 5,ox:0,oy:0,nx:0,ny:0};
direction=direction.toLowerCase();
//配置：划的范围在5X5像素内当点击处理
obj.addEventListener("touchstart",function() {
defaults.ox = event.targetTouches[0].pageX;
defaults.oy = event.targetTouches[0].pageY;
defaults.nx = defaults.ox;
defaults.ny = defaults.oy;
if(direction.indexOf("touchstart")!=-1)fun();
}, false);
obj.addEventListener("touchmove",function() {
event.preventDefault();
defaults.nx = event.targetTouches[0].pageX;
defaults.ny = event.targetTouches[0].pageY;
if(direction.indexOf("touchmove")!=-1)fun();
}, false);
obj.addEventListener("touchend",function() {
var changeY = defaults.oy - defaults.ny;
var changeX = defaults.ox - defaults.nx;
if(Math.abs(changeX)>Math.abs(changeY)&&Math.abs(changeY)>defaults.y){
//左右事件
if(changeX > 0) {
if(direction.indexOf("swipeleft")!=-1)fun();
}else{
if(direction.indexOf("swiperight")!=-1)fun();
}
}else if(Math.abs(changeY)>Math.abs(changeX)&&Math.abs(changeX)>defaults.x){
//上下事件
if(changeY > 0) {
console.log('a');
if(direction.indexOf("swipetop")!=-1)fun();
}else{
if(direction.indexOf("swipedown")!=-1)fun();
}
}else{
//点击事件
if(direction.indexOf("singleTap")!=-1)fun();
}
if(direction.indexOf("touchend")!=-1)fun();
}, false);
}
function fun(){
console.log('回调函数');
}
var swipetop = 'swipetop';
window.onload=touches(window,swipetop);