如何使用HTML5和canvas或SVG绘制网格？

//we are setting the grid width and height
var grid_w = 两00;
var grid_h = 两00;

//we are setting padding around grid
var gridp = 15;

//we are defining size of canvas by defining its width and height
var canvas_w = grid_w + (gridp*二) + 1;
var canvas_h = grid_h + (gridp*两) + 1;
var canvas = $(&#39;<canvas/>&#39;).attr({width: canvas_w, height: canvas_h}).appendTo(&#39;body&#39;);
var ctx = canvas.get(0).getContext("两d");

function drawBoard(){
   for (var a = 0; a <= grid_w; a += 50) {
      ctx.moveTo(0.5 + a + gridp, gridp);
      ctx.lineTo(0.5 + a+ gridp, grid_h + gridp);
   }