asp手写签名代码2021版提供源码控件

今天接了一个小事，一个朋友想实现货物在线签收，要收货人在线签名，并保存入库，让我帮忙写一个asp的手写签名功能，忙活一下午实现了，估计会有很多人有这种需求，放网上吧

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
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