camera api (含图片预览)

• 主要为利用input type=file, accept="image/*" 进行处理
• 图片预览方式（两种）

const file = e.target.files[0]// 方式1 const url1 = window.URL.createObjectURL(file);let url2// 方式2const reader = new FileReader();reader.onload = (e) => {    url2 = e.target.result;};reader.readAsDataURL(file);

touch events (触屏事件)

• touchstart
• touchend
• touchcancel 电话的接入或者弹出信息等比较高级的事件触发，一般做保存操作
• touchmove

geolocation

• 注意谷歌浏览器要https才能提供定位服务

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!')    }

device orientation and motion

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)

Pointer Lock(鼠标锁定)

锁住它!    
    

// 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();    }