html5生成柱状图(条形图)效果的实例代码

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下面小编就为大家分享一篇html5生成柱状图(条形图)效果的实例代码。小编觉得挺不错的，现在分享给大家，也给大家一个参考。一起跟随小编过来看看吧

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<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：

html5生成柱状图(条形图)效果的实例代码

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