function random(max) {
    return Math.floor(Math.random() * max);
}
function on(dom, type, fn) {
    dom.addEventListener(type, fn, false);
}
on(document.body, 'click', function(e) {
    console.log('click事件 x:'+e.clientX, 'y:'+e.clientY);
});
/**
 * MouseEvent
 * 包括事件 click，dblclick，mouseup，mousedown
 */
function mouse() {
    var x = random(window.outerWidth),
        y = random(window.outerHeight);
    var event = new MouseEvent('click', {
        bubbles: true,
        cancelable: true,
        view: window,
        clientX: x,
        clientY: y
    });
    console.log('click环境 x:'+x, 'y:'+y);
    document.body.dispatchEvent(event);
}
mouse();

on(document.body, 'touchstart', function(e) {
  var touch = e.touches.item(0);
  console.log('touchstart x:' + touch.clientX, 'y:' + touch.clientY);
});
on(document.body, 'touchmove', function(e) {
  var touch = e.touches.item(0);
  console.log('touchmove x:' + touch.clientX, 'y:' + touch.clientY);
});
on(document.body, 'touchend', function(e) {
  var touch = e.changedTouches.item(0);
  console.log('touchend x:' + touch.clientX, 'y:' + touch.clientY);
});
on(window, 'scroll', function(e) {
  console.log('scroll timestamp:' + e.timeStamp);
});
/**
 * TouchEvent
 * 包括事件 touchstart，touchend，touchmove，touchcancel
 */
function touchstart(x, y, number) {
  var touch = new Touch({
    identifier: number,
    target: document.querySelector('.drag'), //随便设置的
    clientX: x,
    clientY: y
  });
  console.log('touchstart环境 x:' + x, 'y:' + y);
  var event = new TouchEvent('touchstart', {
    touches: [touch],
    targetTouches: [touch],
    changedTouches: [touch]
  });
  document.body.dispatchEvent(event); //touchstart
}

function touchmove(x, y, interval, number) {
  var touch = new Touch({
    identifier: number,
    target: document.querySelector('.drag'), //随便设置的
    clientX: x,
    clientY: y + interval
  });
  var event = new TouchEvent('touchmove', {
    touches: [touch],
    targetTouches: [touch],
    changedTouches: [touch]
  });
  document.body.dispatchEvent(event); //touchmove
}

function touch() {
  var x = random(window.outerWidth),
    y = random(window.outerHeight),
    number = 1,
    interval = 10;
  touchstart(x, y, number);
  number++;
  touchmove(x, y, interval, number);
  number++;
  interval += 10;
  touchmove(x, y, interval, number);
  number++;
  interval += 10;
  touchmove(x, y, interval, number);

  document.body.scrollTop = interval; //自动滚动
}
setTimeout(function() {
  touch();
}, 2000);

on(document.getElementById('txt'), 'focus', function(e) {
  //console.log(e);
  console.log('focus timestamp:' + e.timeStamp);
});
/**
 * FocusEvent
 * 包括事件 focus, blur, focusin, focusout
 */
function focus() {
  var event = new FocusEvent('focus', {
    view: window
  });
  document.getElementById('txt').dispatchEvent(event);
}
focus();