heyang

component/navbar.vue

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+<template>
+	<view>
+		<view class="wx-head-mod" :style="{height:navHeight+'rpx'}">
+			<view class="wx-head-mod-nav" :style="{height:navigationBarHeight+'rpx',top:statusBarHeight+'rpx'}">
+				<view class="wx-head-mod-nav-content"
+					:style="{height:customHeight+'rpx',justifyContent:'left'}">
+					<!-- 文本区 -->
+					<view class="wx-head-mod-nav-content-mian"
+						:style="{lineHeight:customHeight + 'rpx'}">
+						{{title}}
+					</view>
+				</view>
+			</view>
+		</view>
+
+	
+	</view>
+</template>
+ 
+<script>
+	import {systemInfo} from '@/component/system-info.js'
+	export default {
+		name: "HeadView",
+		props: {
+			// 文本区内容
+			title:'',
+		},
+		data() {
+			return {
+				statusBarHeight: 0, //状态栏高度
+				navHeight: 0, //头部导航栏总体高度
+				navigationBarHeight:0, //导航栏高度
+				customHeight: 0, //胶囊高度
+				scaleFactor: 0, //比例系数
+				menubarLeft:0, //胶囊定位的左边left
+				windowWidth: 0
+			};
+		},
+		methods: {
+
+		},
+		created() {
+			/* 获取设备信息 */
+			const SystemInfomations = systemInfo()
+			/* 通用平台 */
+			this.statusBarHeight = SystemInfomations.statusBarHeight //状态栏高度
+			this.scaleFactor = SystemInfomations.scaleFactor //比例系数
+			this.windowWidth = SystemInfomations.windowWidth //当前设备的屏幕宽度
+			/* 微信小程序平台 */
+			// #ifdef MP-WEIXIN
+			this.navHeight = SystemInfomations.navHeight + SystemInfomations.statusBarHeight //头部导航栏总高度
+			this.navigationBarHeight = SystemInfomations.navHeight //头部导航栏高度
+			this.customHeight = SystemInfomations.menuButtonHeight //胶囊高度
+			this.menubarLeft = SystemInfomations.menuButtonLeft //胶囊左边界距离左上角的距离
+			// #endif
+		}
+	}
+</script>
+ 
+<style>
+
+	.wx-head-mod {
+		box-sizing: border-box;
+		width: 100%;
+		position: fixed;
+		top: 0;
+		left: 0;
+		background: #0183FA;
+		/* background: linear-gradient(-35deg, #613A19 0%, #6F4E2B 100%); */
+	}
+ 
+	.wx-head-mod-nav {
+		box-sizing: border-box;
+		width: 100%;
+		position: absolute;
+		left: 0;
+		display: flex;
+		justify-content: center;
+		align-items: center;
+ 
+	}
+ 
+	.wx-head-mod-nav-content {
+		box-sizing: border-box;
+		width: 100%;
+		display: flex;
+		justify-content: left;
+		align-items: center;
+		position: relative;
+		padding-left: 30rpx;
+		box-sizing: border-box;
+		
+	}
+ 
+	/* 文本区 */
+	.wx-head-mod-nav-content-mian {
+		box-sizing: border-box;
+		height: 100%;
+		text-align: center;
+		white-space: nowrap;
+		text-overflow: ellipsis;
+		overflow: hidden;
+		color:#fff;
+		font-size:36rpx;
+	}
+ 
+	/* 返回按钮 */
+	.wx-head-mod-nav-content-back {
+		box-sizing: border-box;
+		width: 60rpx;
+		height: 100%;
+		/* background-color: aqua; */
+		position: absolute;
+		top: 0;
+		left: 32rpx;
+		display: flex;
+		align-items: center;
+		justify-content: left;
+	}
+ 
+	.wx-head-mod-nav-content-back-img {
+		box-sizing: border-box;
+	}
+ 
+	
+ </style>

component/system-info.js

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+/**
+ * 此js文件管理关于当前设备的机型系统信息
+ */
+const systemInfo = function() {
+	/****************** 所有平台共有的系统信息 ********************/
+	// 设备系统信息
+	let systemInfomations = uni.getSystemInfoSync()
+	// 机型适配比例系数
+	let scaleFactor = 750 / systemInfomations.windowWidth
+	// 当前机型-屏幕高度
+	let windowHeight = systemInfomations.windowHeight * scaleFactor //rpx
+	// 当前机型-屏幕宽度
+	let windowWidth = systemInfomations.windowWidth * scaleFactor //rpx
+	// 状态栏高度
+	let statusBarHeight = (systemInfomations.statusBarHeight) * scaleFactor //rpx
+ 
+	// 导航栏高度  注意：此导航栏高度只针对微信小程序有效 其他平台如自定义导航栏请使用：状态栏高度+自定义文本高度
+	let navHeight = 0 //rpx
+	// console.log(windowHeight,'哈哈哈哈哈');
+	
+	/****************** 微信小程序头部胶囊信息 ********************/
+	// #ifdef MP-WEIXIN
+	const menuButtonInfo = wx.getMenuButtonBoundingClientRect()
+	// 胶囊高度
+	let menuButtonHeight = menuButtonInfo.height * scaleFactor //rpx
+	// 胶囊宽度
+	let menuButtonWidth = menuButtonInfo.width * scaleFactor //rpx
+	// 胶囊上边界的坐标
+	let menuButtonTop = menuButtonInfo.top * scaleFactor //rpx
+	// 胶囊右边界的坐标
+	let menuButtonRight = menuButtonInfo.right * scaleFactor //rpx
+	// 胶囊下边界的坐标
+	let menuButtonBottom = menuButtonInfo.bottom * scaleFactor //rpx
+	// 胶囊左边界的坐标
+	let menuButtonLeft = menuButtonInfo.left * scaleFactor //rpx
+ 
+	// 微信小程序中导航栏高度 = 胶囊高度 + (顶部距离 - 状态栏高度) * 2
+	navHeight = menuButtonHeight + (menuButtonTop - statusBarHeight) * 2
+	// #endif
+ 
+ 
+	// #ifdef MP-WEIXIN
+	return {
+		scaleFactor,
+		windowHeight,
+		windowWidth,
+		statusBarHeight,
+		menuButtonHeight,
+		menuButtonWidth,
+		menuButtonTop,
+		menuButtonRight,
+		menuButtonBottom,
+		menuButtonLeft,
+		navHeight
+	}
+	// #endif
+ 
+	// #ifndef MP-WEIXIN
+	return {
+		scaleFactor,
+		windowHeight,
+		windowWidth,
+		statusBarHeight
+	}
+	// #endif
+}
+ 
+export {
+	systemInfo
+}

pages_student/component/compress.vue

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+<template>
+	<view class="compress">
+		<canvas :style="{ width: canvasSize.width,height: canvasSize.height}" canvas-id="myCanvas"></canvas>
+	</view>
+</template>
+
+<script>
+	export default {
+		data() {
+			return {
+				pic:'',
+				canvasSize: {
+					width: 0,
+					height: 0
+				}
+			}
+		},
+		methods: {
+			// 压缩
+			compress(params) {
+				return new Promise(async (resolve, reject) => {
+					// 等待图片信息
+					let info = await this.getImageInfo(params.src).then(info=>info).catch(err=>err);
+					
+					if(!info){
+						reject('获取图片信息异常');
+						return;
+					}
+					
+					// 设置最大 & 最小 尺寸
+					const maxSize = params.maxSize || 1080;
+					const minSize = params.minSize || 640;
+					
+					// 当前图片尺寸
+					let {width,height} = info;
+					
+					// 非 H5 平台进行最小尺寸校验
+					// #ifndef H5
+					if(width <= minSize && height <= minSize){
+						resolve(params.src);
+						return;
+					}
+					// #endif
+					
+					// 最大尺寸计算
+					if (width > maxSize || height > maxSize) {
+						if (width > height) {
+							height = Math.floor(height / (width / maxSize));
+							width = maxSize;
+						} else {
+							width = Math.floor(width / (height / maxSize));
+							height = maxSize;
+						}
+					}
+
+					// 设置画布尺寸
+					this.$set(this,"canvasSize",{
+						width: `${width}rpx`,
+						height: `${height}rpx`
+					});
+					
+					// Vue.nextTick 回调在 App 有异常，则使用 setTimeout 等待DOM更新
+					setTimeout(() => {
+						const ctx = uni.createCanvasContext('myCanvas', this);
+						ctx.clearRect(0,0,width, height)
+						ctx.drawImage(info.path, 0, 0, uni.upx2px(width), uni.upx2px(height));
+						ctx.draw(false, () => {
+							uni.canvasToTempFilePath({
+								x: 0,
+								y: 0,
+								width: uni.upx2px(width),
+								height: uni.upx2px(height),
+								destWidth: width,
+								destHeight: height,
+								canvasId: 'myCanvas',
+								fileType: params.fileType || 'png',
+								quality: params.quality || 0.9,
+								success: (res) => {
+									// 在H5平台下，tempFilePath 为 base64
+									resolve(res.tempFilePath);
+								},
+								fail:(err)=>{
+									reject(null);
+								}
+							},this);
+						});
+					}, 300);
+				});
+			},
+			// 获取图片信息
+			getImageInfo(src){
+				return new Promise((resolve, reject)=>{
+					uni.getImageInfo({
+						src,
+						success: (info)=> {
+							resolve(info);
+						},
+						fail: () => {
+							reject(null);
+						}
+					});
+				});
+			},
+			// 批量压缩
+			batchCompress(params){
+				// index:进度，done:成功，fail:失败
+				let [index,done,fail] = [0,0,0];
+				// 压缩完成的路径集合
+				let paths = [];
+				// 批量压缩方法
+				let batch = ()=>{
+					return new Promise((resolve, reject)=>{
+						// 开始
+						let start = async ()=>{
+							params.progress && params.progress({
+								done,
+								fail,
+								count:params.batchSrc.length
+							});
+							// 等待图片压缩方法返回
+							let path = await next();
+							if(path){
+								done++;
+								paths.push(path);
+							}else{
+								fail++;
+							}
+							
+							index++;
+							// 压缩完成
+							if(index >= params.batchSrc.length){
+								resolve(true);
+							}else{
+								start();
+							}
+						}
+						start();
+					});
+				}
+				// 依次调用压缩方法
+				let next = ()=>{
+					return this.compress({
+						src:params.batchSrc[index],
+						maxSize:params.maxSize,
+						fileType:params.fileType,
+						quality:params.quality,
+						minSize:params.minSize
+					})
+				}
+				
+				// 全部压缩完成后调用
+				return new Promise(async (resolve, reject)=>{
+					// 批量压缩方法回调
+					let res = await batch();
+					if(res){
+						resolve(paths);
+					}else{
+						reject(null);
+					}
+				});
+			}
+		}
+	}
+</script>
+
+<style lang="scss" scoped>
+	.compress{
+		position: fixed;
+		width: 12px;
+		height: 12px;
+		overflow: hidden;
+		top: -99999px;
+		left: 0;
+	}
+</style>