JavaScript实现的DOM绘制柱状图效果示例

时间：2021-05-26

本文实例讲述了JavaScript实现的DOM绘制柱状图效果。分享给大家供大家参考，具体如下：

<!DOCTYPE html><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>www.jb51.net JavaScript DOM绘制柱状图</title> <style> #chart-wrap{ width:910px; height:240px; border:solid 1px #B3B3DC; position:relative; top:40px; left:20px; } </style> </head> <body> <div id="chart-wrap"></div> <script> function renderChart(data) { var cw = document.getElementById("chart-wrap"); cw.innerHTML = ""; var max = 0; for (var index in data) { if (data[index] > max) max = data[index]; } var percent = 180 / max; var i = 0; for (var index in data) { var bar = document.createElement("div"); bar.id = index + "_" + data[index]; bar.style.height = Math.round(percent * data[index]) + "px"; bar.style.width = "40px"; bar.style.left = (i * 40) + 165 + "px"; bar.style.marginLeft = (i * 20) + "px"; bar.style.position = "absolute"; bar.style.background = "none repeat scroll 0 0 pink"; bar.style.overflow = "hidden"; bar.setAttribute("title", index + "：" + data[index]); bar.style.display = "block"; bar.style.top = 200 - Math.round(percent * data[index]) + "px"; cw.appendChild(bar); var axis = document.createElement("div"); axis.id = "axis_" + i; axis.style.width = "40px"; axis.style.left = (i * 40) + 165 + "px"; axis.style.marginLeft = (i * 20) + "px"; axis.style.textAlign = "center"; axis.style.position = "absolute"; axis.style.top = "205px"; axis.innerHTML = '<span style="font-size:12px; color:grey;"> ' + i + '</span>'; cw.appendChild(axis); i++; } for (var i = 0; i < 5; i++) { var ayis = document.createElement("div"); ayis.style.width = "30px"; ayis.style.position = "absolute"; ayis.style.top = (36 * i) + (20 - 6) + "px"; ayis.style.left = "140px"; ayis.innerHTML = '<span style="font-size:12px; color:grey;"> ' + Math.round(max - (max / 5) * i) + '</span>'; cw.appendChild(ayis); var line = document.createElement("div"); line.setAttribute("style", "width:580px; left:165px; border-top:1px dotted grey; height:1px; line-height:1px; display:block; overflow:hidden; position:absolute; "); line.style.top = (36 * i) + 20 + "px"; cw.appendChild(line); } } var data = [10,60,50,30,40,80,20,70,100,90]; renderChart(data); </script> </body></html>

运行效果如下：

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript操作DOM技巧总结》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。

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