h5手工签名网页代码

const cvs = document.getElementById('cvs')
        cvs.width = document.documentElement.clientWidth
        cvs.height = document.documentElement.clientHeight
        const ctx = cvs.getContext('2d')
        let isDrawing = false
        cvs.addEventListener('mousedown', e => {
            isDrawing = true
            ctx.moveTo(e.pageX, e.pageY)
        })
        cvs.addEventListener('mousemove', e => {
            if (isDrawing) {
                ctx.lineWidth = 10
                ctx.lineTo(e.pageX, e.pageY)
                ctx.stroke()
            }
        })
        cvs.addEventListener('mouseup', e => {
            isDrawing = false
        })