HTML5 device access 设备访问详解

2020-04-21 22:44:26易采站长站整理

camera api (含图片预览)

参考地址

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

touch events (触屏事件)

参考地址

touchstart
touchen
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

参考地址

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

参考地址 


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)

参考地址 


<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);