After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Two commonly used client-side output methods in JavaScript
<script type="text/javascript"> //在<body>中输出一句话 document.write("欢迎来到php.cn"); window.alert("I am yufeng xiao"); </script> 先显示alert的内容，再显示write的内容
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