canvas原生实现前端网页移动端签名

let c = document.getElementById("canvas") let canvas = document.createElement("canvas") let availHeight = document.documentElement.clientHeight let off = availHeight - 400 canvas.height = '350' canvas.width = c.clientWidth c.appendChild(canvas) let dr = canvas.getContext('2d') dr.strokeStyle = 'blue' canvas.addEventListener('touchstart',(e)=>{   dr.beginPath()   dr.moveTo(e.changedTouches["0"].pageX,e.changedTouches["0"].pageY-off) }) canvas.addEventListener('touchmove',(e)=>{   dr.lineTo(e.changedTouches[0].pageX, e.changedTouches[0].pageY-off)   dr.stroke() }) canvas.addEventListener('touchend',(e)=>{   dr.closePath() })

生成图片

let img = document.querySelector('canvas').toDataURL()

如需发送给后端，可以让后端支持base64或者blob、buffer

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