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2
const reader = new FileReader();
reader.onload = (e) => {
url2 = e.target.result;
};
reader.readAsDataURL(file);
touch events (触屏事件)
- 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
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)
<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();
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
