有没有一种方法可以禁用向右水平滚动，但允许向左水平滚动？

Question

Is there a way to disable right horizontal scrolling, but allow left horizontal scrolling?

let touches = []
window.addEventListener('touchmove', event => {
  event.preventDefault()
}, false)

window.addEventListener('touchstart', event => {
  touches[0] = event.touches[0].pageX
}, false)

window.addEventListener('touchend', event => {
  touches[1] = event.changedTouches[0].pageX
}, false)

It seems you would have to preventDefault() on the touchmove event.

Answer 1

touchmove returns list of touche

1. touchmove event object has list of touches
2. get the first touch, and prevent default in all cases.
3. on move compare new x value with old x value
4. if nx - ox > 0 then move manually.

Example: http://codepen.io/anon/pen/LWQJvx

var old_x = null;

document.addEventListener('touchstart', function(e) {
  old_x = e.targetTouches[0].clientX;
}, false); 

document.addEventListener('touchcancel', function(e) {
  old_x = e.targetTouches[0].clientX;
}, false); 


document.addEventListener('touchmove', function(e) {
  var touch = e.touches[0];
  if (touch.clientX - old_x < 0 ) {
    document.body.scrollLeft +=  old_x - touch.clientX;
  }
  old_x = touch.clientX;
  e.preventDefault();
  return false;   
}, { passive: false });