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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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