我把代码精简到一个简单的页面上，包括flog插件和jquery文件，但仍然无法在IE 7和8中渲染flot图。我可能遗漏了一些东西，但我使用的是flot 8.1（7.0运行良好）。
我把它剪成一个简单的页面，里面有我认为必要的脚本。感谢您提供的任何帮助！
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<script type='text/javascript' src='js/plugins/jquery/jquery-1.9.1.min.js'></script>
<script type='text/javascript' src='js/plugins/jquery/jquery-ui-1.10.1.custom.min.js'></script>
<script type='text/javascript' src='js/plugins/jquery/jquery-migrate-1.1.1.min.js'></script>
<script type='text/javascript' src='js/plugins/other/excanvas.js'></script>
<script type='text/javascript' src='js/plugins/flot/jquery.flot.js'></script>
<script type='text/javascript' src='js/plugins/flot/jquery.flot.stack.js'></script>
<script type='text/javascript' src='js/plugins/flot/jquery.flot.pie.js'></script>
<script type='text/javascript' src='js/plugins/flot/jquery.flot.resize.js'></script>
</head>
<body class="smw ssDark">
<div class="header">
<div id="chart_activity" style="height:500px;" >
</div>
</div>
<script>
$("document").ready(function(){
if($("#chart_activity").length > 0){
var stuff = [], contacts = [];
for (var i = 0; i < 7; i += 1) {
stuff.push([i, parseInt(Math.random() * 30)]);
contacts.push([i, parseInt(Math.random() * 30)]);
}
$.plot($("#chart_activity"), [ { data: stuff, label: "stuff"}, { data: contacts, label: "contacts"}], {xaxis: {show: true}, yaxis: { show: true}});
}
});
</script>
</body>
</html>
编辑：忘了提，我在IE控制台中得到以下错误：
SCRIPT5007: Unable to get property 'fillStyle' of undefined or null reference
excanvas.js, line 230 character 5
很抱歉很慢才给出答案。显然，我下载的excanvas版本与Flot附带的版本有些不同。一旦我把它们换掉，IE 7/8中的一切都很好。