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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>webrx</title>
<script src="../jquery-3.3.1.js"></script>
<script>
$(document).ready(function () {
alert("第一种");
});
$().ready(function () {
alert("第二种");
})
$(function () {
alert("第三种");
})
</script>
</head>
<body>
</body>
</html>
结果：
