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Why does jquery write entry functions?

(*-*)浩Original: 2019-05-30 11:43:433061browse

The role of the entry function, waiting for the page to be loaded, has an independent scope,

jQuery entry function The writing method is as follows

<script>
        // 方式一
        $(document).ready(function () {
            alert("hello lnj");
        });        // 方式二,最常使用的一种
        $(function () {
            alert("hello lnj");
        });        // 方式三
        jQuery(document).ready(function () {
            alert("hello lnj");
        });        // 方式四
        jQuery(function () {
            alert("hello lnj");
        });
</script>

Example:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<script src="jquery-1.7.1.js" type="text/javascript"></script>
</head>
<body style=" overflow-y:scroll;overflow-x:auto;">
<input type="text"  id="dd1" value="" />
<textarea id="tt" cols="30" rows="30"></textarea>
</body>
<script>
var i=1;
//jQuery方式

$(function(){
var str=$("#tt").val()+'\r\n'+'$_B加载完毕'+i;
$("#tt").val(str);
i++;
}) ;

</html>

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