jyred/pages/form/demo.vue

<template>
    <view>
        <canvas style="width: 750px; height: 200px;" canvas-id="firstCanvas" id="firstCanvas"></canvas>
        <!-- <canvas style="width: 400px; height: 500px;" canvas-id="secondCanvas" id="secondCanvas"></canvas> -->
        <!-- <canvas style="width: 400px; height: 500px;" canvas-id="secondCanvas" id="secondCanvas" @error="canvasIdErrorCallback"></canvas> -->
    </view>
</template>

<script>
	export default {
	    onReady: function (e) {
	        var context = uni.createCanvasContext('firstCanvas')
	
	        context.setStrokeStyle("#00ff00")
	        context.setLineWidth(5)
	        context.rect(0, 0, 200, 200)
	        context.stroke()
	        // context.setStrokeStyle("#ff0000")
	        // context.setLineWidth(2)
	        // context.moveTo(160, 100)
	        // context.arc(100, 100, 60, 0, 2 * Math.PI, true)
	        // context.moveTo(140, 100)
	        // context.arc(100, 100, 40, 0, Math.PI, false)
	        // context.moveTo(85, 80)
	        // context.arc(80, 80, 5, 0, 2 * Math.PI, true)
	        // context.moveTo(125, 80)
	        // context.arc(120, 80, 5, 0, 2 * Math.PI, true)
	        // context.stroke()
	        context.draw()
	    },
	    methods: {
	        canvasIdErrorCallback: function (e) {
	            console.error(e.detail.errMsg)
	        }
	    }
	}
</script>