html5生成柱状图(条形图)效果的实例代码

作者：佚名字体：[增加减小] 来源：互联网时间：2017-08-06

本文主要包含html5,柱状图,条形图等相关知识,佚名希望在学习及工作中可以帮助到您

<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);

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