<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>认识语句</title>
<script type="text/javascript">
document.write("Hello");
document.write("World");
</script>
</head>
<body>
</body>
</html>
浏览器里面输出：HelloWorld,并没有换行，要换行document.write("<br>");或者把document.write("Hello")改为document.write("Hello"+“<br>”);分好只是表示一句结束原文：http://blog.csdn.net/u012110719/article/details/40833909