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一、cavans 对象获取、上线文创建
1.wxml
- <!-- canvas.wxml -->
- <canvas type="2d" id="myCanvas"></canvas>
2.js
-
- /**
- * 生命周期函数--监听页面加载
- */
- onLoad(options) {
-
-
- const query = wx.createSelectorQuery()
- query.select('#myCanvas')
- .fields({
- node: true,
- size: true
- })
- .exec((res) => {
- const canvas = res[0].node
- const ctx = canvas.getContext('2d')
- //分辨率处理
- const dpr = wx.getSystemInfoSync().pixelRatio
- canvas.width = res[0].width * dpr
- canvas.height = res[0].height * dpr
- ctx.scale(dpr, dpr)
- ctx.fillRect(0, 0, 100, 100);
- })
-
- },

3.css 代码忽略
结果:
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