JS案例：比较两个数的大小
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>比较两个数的大小示例</title>
</head><body>
<script type="text/javascript">
var score=80;
document.write("score变量的值为："+score+"<br>");
document.write("score>=70："+(score>=70)+"<br>");
document.write("score<70："+(score<70)+"<br>");
document.write("score!=70："+(score!=70)+"<br>");
document.write("score>70："+(score>70)+"<br>");
</script>
</body></html>
