最近公司在做一个签名的功能，主要用到了canvas画线的功能结合移动端touch事件
js部分是这样的：
window.onload = function() { new lineCanvas({ el: document.getElementById(canvas),//绘制canvas的父级div clearEl: document.getElementById(clearCanvas),//清除按钮 saveEl: document.getElementById(saveCanvas),//保存按钮 // linewidth:1,//线条粗细，选填 // color:black,//线条颜色，选填 // background:#ffffff//线条背景，选填 });};function lineCanvas(obj) { this.linewidth = 1; this.color = #000000; this.background = #ffffff; for (var i in obj) { this[i] = obj[i]; }; this.canvas = document.createElement(canvas); this.el.appendChild(this.canvas); this.cxt = this.canvas.getContext(2d); this.canvas.width = this.el.clientWidth; this.canvas.height = this.el.clientHeight; this.cxt.fillStyle = this.background; this.cxt.fillRect(0, 0, this.canvas.width, this.canvas.width); this.cxt.strokeStyle = this.color; this.cxt.lineWidth = this.linewidth; this.cxt.lineCap = round; //开始绘制 this.canvas.addEventListener(touchstart, function(e) { this.cxt.beginPath(); this.cxt.moveTo(e.changedTouches[0].pageX, e.changedTouches[0].pageY); }.bind(this), false); //绘制中 this.canvas.addEventListener(touchmove, function(e) { this.cxt.lineTo(e.changedTouches[0].pageX, e.changedTouches[0].pageY); this.cxt.stroke(); }.bind(this), false); //结束绘制 this.canvas.addEventListener(touchend, function() { this.cxt.closePath(); }.bind(this), false); //清除画布 this.clearEl.addEventListener(click, function() { this.cxt.clearRect(0, 0, this.canvas.width, this.canvas.height); }.bind(this), false); //保存图片，直接转base64 this.saveEl.addEventListener(click, function() { var imgBase64 = this.canvas.toDataURL(); console.log(imgBase64); }.bind(this), false);};这是效果图：
附上html和css
<div id=canvas> <p id=clearCanvas>清除</p> <p id=saveCanvas>保存</p></div>html,body{ width: 100%; height: 100%;}#canvas{ width: 100%; height: 100%; position: relative;}#canvas canvas{ display: block;}#clearCanvas{ width: 50%; height: 40px; line-height: 40px; text-align: center; position: absolute; bottom: 0; left: 0; border: 1px solid #DEDEDE; z-index: 1;}#saveCanvas{ width: 50%; height: 40px; line-height: 40px; text-align: center; position: absolute; bottom: 0; right: 0; border: 1px solid #DEDEDE; z-index: 1;}以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持VeVb武林网。