4.canvas-路径

var can=document.getElementById("mycanvas");
    var draw=can.getContext("2d");
    // 开始一个路径
    draw.beginPath();
    // 设置线的粗细
    draw.lineWidth="5";
    //设置线的颜色
    draw.strokeStyle="green";
    // 线的起点
    draw.moveTo(0,75);
    //线的终点 
    draw.lineTo(250,75);
    // 开始绘制路径
    draw.stroke();
    //开始另一个路径
    draw.beginPath();
    // 设置线的粗细
    draw.lineWidth="5";
    draw.strokeStyle="purple";
    draw.moveTo(25,05);
    draw.lineTo(35,25);
    draw.stroke();

效果：