如何使用Uniapp绘制横线

// 样式.line {  border-bottom: 1px solid #000; // 下边框  height: 1px;  margin-top: 10px;}// html<view class="line"></view>

// html<canvas style="width: 100%; height: 200px;" canvas-id='first-canvas'></canvas>// jsonReady() {  const query = uni.createSelectorQuery().in(this);  query.select('#first-canvas').fields({    node: true,    size: true,  }).exec((res) => {    const canvas = res[0].node;    const ctx = canvas.getContext('2d');    const dpr = uni.getSystemInfoSync().pixelRatio;    canvas.width = res[0].width * dpr;    canvas.height = res[0].height * dpr;    ctx.lineWidth = 1 * dpr;    ctx.strokeStyle = '#000000';    ctx.beginPath();    ctx.moveTo(0, 100 * dpr);    ctx.lineTo(canvas.width, 100 * dpr);    ctx.stroke();  });}