const file = e.target.files[0]
// 方式1 
const url1 = window.URL.createObjectURL(file);
let url2

// 方式2
const reader = new FileReader();
reader.onload = (e) => {
  url2 = e.target.result;
};
reader.readAsDataURL(file);

  if (navigator.geolocation){
    navigator.geolocation.getCurrentPosition((position) => {
      this.geolocation = `latitude:${position.coords.latitude},longitude:${position.coords.longitude}`
    }, (err) => {
      console.log(err);
    }, {
        enableHighAccuracy: true, 
        maximumAge    : 30000, // buffer memory timre
        timeout      : 27000  // waiting time 
    })
  } else {
    alert('geolocation not supported!')
  }

  window.addEventListener('deviceorientation',(doe) => {
    this.absolute = doe.absolute //false 表示方向数据由设备本身坐标系提供
    this.alpha = doe.alpha // 绕Z轴0-360 进入时手机水平正对的方向为0或360
    this.beta = doe.beta // 绕X轴-180~180 描述由前向后旋转
    this.gamma = doe.gamma // 绕Y轴-90~90 描述由左向右旋转
  }, true)

  // chrome v65 只支持accelerationIncludingGravity和interval（应该因为一些限制没有找到），其它浏览器最新版基本都支持
  window.addEventListener('devicemotion', (dme) => {
    this.acceleration = dme.acceleration
    this.accelerationIncludingGravity = dme.accelerationIncludingGravity
    this.rotationRate = dme.rotationRate
    this.interval = dme.interval 
  }, false)

  <button onclick="lockPointer();">锁住它!</button>
  <div id="pointer-lock-element" style="width:500px;height:500px;background-color: red"></div>

  // 简单示例，将鼠标锁定在 pointer-lock-element 元素内
  let = document.getElementById("pointer-lock-element");
  
  document.addEventListener("mousemove", function(e) {
    var movementX = e.movementX 
      movementY = e.movementY

    // 打印鼠标移动的增量值。
    console.log("X=" + movementX, "Y=" + movementY);
  }, false);

  function lockPointer() {
    elem = document.getElementById("pointer-lock-element");
    elem.requestPointerLock = elem.requestPointerLock  ||
              elem.mozRequestPointerLock ||
              elem.webkitRequestPointerLock;
    elem.requestPointerLock();
  }