首页下载资源前端weapp-qrcode-canvas-2d

ZIPweapp-qrcode-canvas-2d

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资源文件列表:

weapp-qrcode-canvas-2d-master.zip 大约有25个文件
  1. weapp-qrcode-canvas-2d-master/
  2. weapp-qrcode-canvas-2d-master/.editorconfig 147B
  3. weapp-qrcode-canvas-2d-master/.eslintignore 38B
  4. weapp-qrcode-canvas-2d-master/.eslintrc.js 603B
  5. weapp-qrcode-canvas-2d-master/.gitignore 13B
  6. weapp-qrcode-canvas-2d-master/.travis.yml 456B
  7. weapp-qrcode-canvas-2d-master/LICENSE 1.04KB
  8. weapp-qrcode-canvas-2d-master/README.md 5.25KB
  9. weapp-qrcode-canvas-2d-master/build/
  10. weapp-qrcode-canvas-2d-master/build/rollup.dev.config.js 884B
  11. weapp-qrcode-canvas-2d-master/build/rollup.prod.config.js 1.42KB
  12. weapp-qrcode-canvas-2d-master/dist/
  13. weapp-qrcode-canvas-2d-master/dist/weapp.qrcode.common.js 17.07KB
  14. weapp-qrcode-canvas-2d-master/dist/weapp.qrcode.esm.js 17.05KB
  15. weapp-qrcode-canvas-2d-master/dist/weapp.qrcode.js 34.17KB
  16. weapp-qrcode-canvas-2d-master/dist/weapp.qrcode.min.js 16.03KB
  17. weapp-qrcode-canvas-2d-master/examples/
  18. weapp-qrcode-canvas-2d-master/examples/wechat-app/
  19. weapp-qrcode-canvas-2d-master/examples/wechat-app/utils/
  20. weapp-qrcode-canvas-2d-master/examples/wechat-app/utils/weapp.qrcode.js 34.17KB
  21. weapp-qrcode-canvas-2d-master/package-lock.json 103KB
  22. weapp-qrcode-canvas-2d-master/package.json 1.27KB
  23. weapp-qrcode-canvas-2d-master/src/
  24. weapp-qrcode-canvas-2d-master/src/index.js 3.93KB
  25. weapp-qrcode-canvas-2d-master/src/qrcode.js 28.51KB

资源介绍:

weapp-qrcode-canvas-2d在微信小程序中生成二维码,新版canvas-2d接口
# weapp-qrcode-canvas-2d [weapp-qrcode-canvas-2d](https://github.com/DoctorWei/weapp-qrcode-canvas-2d) 是使用新版canvas-2d接口在微信小程序中生成二维码(外部二维码)的js包。canvas 2d 接口支持同层渲染且性能更佳,建议切换使用,可大幅提升速度。 # 仓库地址 - [weapp-qrcode-canvas-2d【码云gitee】](https://gitee.com/WeiDoctor/weapp-qrcode-canvas-2d) - [weapp-qrcode-canvas-2d【github】](https://github.com/DoctorWei/weapp-qrcode-canvas-2d) # 测试环境 - 微信小程序基础库版本:2.10.4 - 开发者工具版本:Stable 1.03.2101150 # Usage 先在 wxml 文件中,创建绘制的 `canvas`,并定义好 `width`, `height`, `id` , `type` ,其中type的值必须为`2d` ```html ``` ## 安装方法1:直接引入 js 文件 直接引入 js 文件,使用 `drawQrcode()` 绘制二维码 ```js // 将 dist 目录下,weapp.qrcode.esm.js 复制到项目中。路径根据实际引用的页面路径自行改变 import drawQrcode from '../../utils/weapp.qrcode.esm.js' ``` ## 安装方法2:npm安装 ``` npm install weapp-qrcode-canvas-2d --save ``` // 然后需要在小程序开发者工具中:构建npm ```js import drawQrcode from 'weapp-qrcode-canvas-2d' ``` ## 安装完成后调用 ### 例子1:没有使用叠加图片 ```js const query = wx.createSelectorQuery() query.select('#myQrcode') .fields({ node: true, size: true }) .exec((res) => { var canvas = res[0].node // 调用方法drawQrcode生成二维码 drawQrcode({ canvas: canvas, canvasId: 'myQrcode', width: 260, padding: 30, background: '#ffffff', foreground: '#000000', text: '大王顶真帅', }) // 获取临时路径(得到之后,想干嘛就干嘛了) wx.canvasToTempFilePath({ canvasId: 'myQrcode', canvas: canvas, x: 0, y: 0, width: 260, height: 260, destWidth: 260, destHeight: 260, success(res) { console.log('二维码临时路径:', res.tempFilePath) }, fail(res) { console.error(res) } }) }) ``` ### 例子2:使用叠加图片(在二维码中加logo) ```js const query = wx.createSelectorQuery() query.select('#myQrcode') .fields({ node: true, size: true }) .exec((res) => { var canvas = res[0].node var img = canvas.createImage(); img.src = "/image/logo.png" img.onload = function () { // img.onload完成后才能调用 drawQrcode方法 var options = { canvas: canvas, canvasId: 'myQrcode', width: 260, padding: 30, paddingColor: '#fff', background: '#fff', foreground: '#000000', text: 'abc123', image: { imageResource: img, width: 80, // 建议不要设置过大,以免影响扫码 height: 80, // 建议不要设置过大,以免影响扫码 round: true // Logo图片是否为圆形 } } drawQrcode(options) // 获取临时路径(得到之后,想干嘛就干嘛了) wx.canvasToTempFilePath({ x: 0, y: 0, width: 260, height: 260, destWidth: 600, destHeight: 600, canvasId: 'myQrcode', canvas: canvas, success(res) { console.log('二维码临时路径为:', res.tempFilePath) }, fail(res) { console.error(res) } }) }; }) ``` # API ## drawQrcode([options]) ### options Type: Object | 参数 | 必须 | 说明 | 示例| | ------ | ------ | ------ | ------ | | canvas | 必须 | 画布标识,传入 canvas 组件实例 | | | canvasId | 非 | 绘制的`canvasId` | `'myQrcode'` | | text | 必须 | 二维码内容 | 'abc123' | | width | 非 | 二维码宽度,与`canvas`的`width`保持一致 | 260 | | padding | 非 | 空白内边距 | 20 | | paddingColor | 非 | 内边距颜色 | 默认与background一致 | | background | 非 | 二维码背景颜色,默认值白色 | `'#ffffff'` | | foreground | 非 | 二维码前景色,默认值黑色 | `'#000000'` | | typeNumber | 非| 二维码的计算模式,默认值-1 | 8 | | correctLevel | 非| 二维码纠错级别,默认值为高级,取值:`{ L: 1, M: 0, Q: 3, H: 2 }` | 1 | | image | 非 | 在 canvas 上绘制图片,层级高于二维码,v1.1.1+版本支持。具体使用见:例子2 | `{imageResource: '', width:80, height: 80, round: true}` | # TIPS weapp-qrcode-canvas-2d 参考以下源码 - 参考 [weapp-qrcode](https://github.com/yingye/weapp-qrcode) - 参考 [jquery-qrcode](https://github.com/jeromeetienne/jquery-qrcode)
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