xml/html code复制内容到剪贴板
<html><canvas id="a_canvas" width="1000" height="700"></canvas><script> (function (){ window.addeventlistener("load", function(){ var data = [1000,1300,2000,3000,2000,2000,1000,1500,2000,5000,1000,1000]; var xinforma = ['1月','2月','3月','4月','5月','6月','7月','8月','9月','10月','11月','12月']; // 获取上下文 var a_canvas = document.getelementbyid('a_canvas'); var context = a_canvas.getcontext("2d"); // 绘制背景 var gradient = context.createlineargradient(0,0,0,300); // gradient.addcolorstop(0,"#e0e0e0"); //gradient.addcolorstop(1,"#ffffff"); context.fillstyle = gradient; context.fillrect(0,0,a_canvas.width,a_canvas.height); var realheight = a_canvas.height-15; var realwidth = a_canvas.width-40; // 描绘边框 var grid_cols = data.length + 1; var grid_rows = 4; var cell_height = realheight / grid_rows; var cell_width = realwidth / grid_cols; context.linewidth = 1; context.strokestyle = "#a0a0a0"; // 结束边框描绘 context.beginpath(); // 准备画横线 /*for(var row = 1; row <= grid_rows; row++){ var y = row * cell_height; context.moveto(0,y); context.lineto(a_canvas.width, y); }*/ //划横线 context.moveto(0,realheight); context.lineto(realwidth,realheight); //画竖线 context.moveto(0,20); context.lineto(0,realheight); context.linewidth = 1; context.strokestyle = "black"; context.stroke(); var max_v =0; for(var i = 0; i<data.length; i++){ if (data[i] > max_v) { max_v =data[i]}; } max_vmax_v = max_v * 1.1; // 将数据换算为坐标 var points = []; for( var i=0; i < data.length; i++){ var v= data[i]; var px = cell_width * (i +1); var py = realheight - realheight*(v / max_v); //alert(py); points.push({"x":px,"y":py}); } //绘制坐标图形 for(var i in points){ var p = points[i]; context.beginpath(); context.fillstyle="green"; context.fillrect(p.x,p.y,15,realheight-p.y); context.fill(); } //添加文字 for(var i in points) { var p = points[i]; context.beginpath(); context.fillstyle="black"; context.filltext(data[i], p.x + 1, p.y - 15); context.filltext(xinforma[i],p.x + 1,realheight+12); context.filltext('月份',realwidth,realheight+12); context.filltext('资金量',0,10); } },false); })(); </script></html>
html5生成柱状图（条形图）详细代码
运行结果：
相关推荐：
html5 touch事件实现触屏页面上下滑动(一)
以上就是html5生成柱状图(条形图)效果的实例代码的详细内容。