為什么我按老師的代碼寫沒有效果
<!doctype?html>
<html>
<head>
<meta?charset="utf-8">
<title>無標(biāo)題文檔</title>
<style>
.container{background:#ddd;width:500px;height:250px;}
</style>
</head>
<body>
<div?class="container"></div>
<script?src="http://d3js.org/d3.v3.js"></script>
<script>
d3.select("container").append("svg:svg");
</script>
</body>
</html>
2016-03-01
?少了"#"