uni-app使用canvas绘制二维码

1. 插件选型

uqrCode

点击安装即可
https://ext.dcloud.net.cn/search?q=uqrCode

2. 页面部分

template：

	
				<view class="canvas-qrcode-box" style="align-self: center;">
					<canvas id="qrcode" canvas-id="qrcode" style="width: 170px;height: 170px;align-self: center;" />
				</view>

3.事件部分

<script>
	var system = uni.getSystemInfoSync();
	import uQRCode from '@/uni_modules/Sansnn-uQRCode/components/uqrcode/common/uqrcode.js'
	export default {
    
    
		data() {
    
    
			return {
    
    
				vlogId: "",
				// screenHeight: system.screenHeight,
				screenHeight: system.safeArea.bottom,
				statusBarHeight: system.statusBarHeight
			}
		},
		onReady() {
    
    
			var vlogId = this.vlogId;
			var content = {
    
    
				type: "vlog",
				content: vlogId
			};
			var contentStr = JSON.stringify(content);
		    uQRCode.make({
    
    
		        canvasId: 'qrcode',
		        componentInstance: this,
		        size: 170,
		        margin: 10,
		        text: contentStr,
		        backgroundColor: '#ffffff',
		        foregroundColor: '#0f0827',
		        fileType: 'png',
		        errorCorrectLevel: uQRCode.errorCorrectLevel.H
		    })
		    .then(res => {
    
    
		    })
		  },
		onLoad(params) {
    
    
			var vlogId = params.vlogId;
			this.vlogId = vlogId;
		},
		methods: {
    
    
			close() {
    
    
				uni.navigateBack({
    
    
					delta: 1,
					animationType: "slide-out-bottom"
				})
			},
		}
	}
</script>