gwlz/jp-mobile/pages/user/setting/signature/signature.vue

<template>
	<view>
		<u--form :model="inputForm" labelWidth="100px" class="u-form" labelPosition="left" ref="inputForm">
			<u-form-item label="旧签名" borderBottom prop="signPic">
				<u--image :showLoading="true" :src="BASE_URL + inputForm.signPic " width="100px"
					height="40px"></u--image>
			</u-form-item>
			<u-form-item label="上传签字图片" borderBottom prop="signPic">
				<u-upload :fileList="fileList" @afterRead="afterRead" @delete="deletePic" :maxCount="1"></u-upload>
			</u-form-item>
			<u--text size="10" type="warning" text="有签名图片,请上传,无,请点击下面签字生成"></u--text>
			<u-form-item label="签字" borderBottom prop="signPic">
				<signInput ref="sign" canvasId="twoDrowCanvas" canvasIds="twoRotateCanvas" :header="header"
					:action="action" @signToUrl="signToUrl">
				</signInput>
			</u-form-item>

			<view class="padding-xl">
				<u-button type="primary" @click="formSubmit" text="提交"></u-button>
			</view>
		</u--form>
	</view>
</template>

<script>
	import userService from "@/api/sys/userService"
	import * as $auth from "@/common/auth.js"
	import BASE_URL from '@/config.js'
	import signInput from "@/components/am-sign-input/am-sign-input.vue"
	export default {

		components: {
			signInput
		},
		data() {
			return {
				action: this.BASE_URL + '/gwfile/upload?uploadPath=sign', //上传服务器的地址
				header: {
					"token": this.$auth.getUserToken()
				}, //图片上传携带头部信息
				loading: false,
				inputForm: this.$auth.getUserInfo(),
				fileList: [],
				signPic: ''
			}
		},

		methods: {
			/**
			 * @param {Object} e
			 * 签名完成回调
			 */
			signToUrl(e) {
				this.signPic = e.data
				if (e.error_code && e.error_code === '201') {
					uni.showToast({
						title: e.msg,
						icon: 'none'
					})
					return
				}
			},
			// 删除图片
			deletePic(event) {
				this.fileList.splice(event.index, 1)
			},
			// 图片压缩
			compressH5(urlData, targetSizeKB, initialQuality = 1.0) {
				const maxQuality = 1.0;
				const minQuality = 0.0;
				const tolerance = 0.01; // 根据需要调整公差
				let that = this
				return new Promise((resolve, reject) => {
					let binarySearch = (min, max) => {
						const midQuality = (min + max) / 2;
						uni.getImageInfo({
							src: urlData.url,
							success(res) {
								let img = new Image()
								img.src = res.path
								img.onload = function() {
									const canvas = document.createElement('canvas');
									const ctx = canvas.getContext('2d');

									canvas.width = img.width;
									canvas.height = img.height;

									ctx.clearRect(0, 0, canvas.width, canvas.height);
									ctx.drawImage(img, 0, 0, canvas.width, canvas.height);

									// 使用异步的 toBlob 方法
									canvas.toBlob(async (blob) => {
										const fileSizeKB = blob.size / 1024;
										if (Math.abs(fileSizeKB - targetSizeKB) <
											tolerance || max - min < tolerance) {
											// 当前质量足够接近目标大小，使用当前质量解析
											const dataUrl = canvas.toDataURL(urlData
												.type, midQuality);
											let result = that
												.uploadFilePromise(dataUrl)
											setTimeout(() => {
												resolve(
													result)
											}, 1000)

										} else if (fileSizeKB > targetSizeKB) {
											// 如果文件大小太大，降低质量，继续二分查找
											binarySearch(min, midQuality);
										} else {
											// 如果文件大小太小，增加质量，继续二分查找
											binarySearch(midQuality, max);
										}
									}, urlData.type, midQuality);
								};
							},
							fail() {
								uni.showModal({
									title: '提示',
									content: '图片压缩失败',
									showCancel: false
								});
							}
						})
					}
					// 开始二分查找
					binarySearch(minQuality, maxQuality);
				})
			},
			// 新增图片
			async afterRead(event) {

				// 当设置 multiple 为 true 时, file 为数组格式，否则为对象格式
				let lists = [].concat(event.file)

				let fileListLen = this.fileList.length
				lists.map((item) => {
					this.fileList.push({
						...item,
						status: 'uploading',
						message: '上传中'
					})
				})
				for (let i = 0; i < lists.length; i++) {

					let result = ""
					if (lists[i].size > (200 * 1024)) {
						result = await this.compressH5(lists[i], 150);

					} else {
						result = await this.uploadFilePromise(lists[i].url)
					}

					let item = this.fileList[fileListLen]

					this.fileList.splice(fileListLen, 1, Object.assign(item, {
						status: 'success',
						message: '',
						url: result
					}))
					console.log("result", result);
					fileListLen++
				}

			},
			uploadFilePromise(url) {
				return new Promise((resolve, reject) => {
					let a = uni.uploadFile({
						url: this.BASE_URL + '/gwfile/upload?uploadPath=signature',
						filePath: url,
						name: 'file',
						header: {
							"token": $auth.getUserToken()
						},
						success: (res) => {
							setTimeout(() => {
								resolve(res.data)
							}, 1000)
						}
					});
				})
			},
			formSubmit: function(e) {
				//定义表单规则
				// this.$refs.inputForm.validate().then(res => {
				uni.showLoading()
				let files = []
				if (this.fileList.length > 0) {
					this.fileList.forEach(item => {
						files.push(item.url)
					})
					this.inputForm.signPic = files.join(",");

				} else {
					this.inputForm.signPic = this.signPic
				}
				userService.saveInfo(this.inputForm).then((data) => {
					$auth.setUserInfo(this.inputForm)
					uni.showToast({
						title: data,
						icon: "success",
						complete: function(res) {
							uni.redirectTo({
								url: '/pages/index/index'
							})
						}
					});

				})
			}
		}
	}
</script>

<style>
	.btn-logout {
		margin-top: 100upx;
		width: 80%;
		border-radius: 50upx;
		font-size: 16px;
		color: #fff;
		background: linear-gradient(to right, #365fff, #36bbff);
	}

	.btn-logout-hover {
		background: linear-gradient(to right, #365fdd, #36bbfa);
	}

	.cu-form-group .title {
		min-width: calc(4em + 40px);
	}
</style>