jQuery更改事件在页面加载时触发输入

问题描述：

当文档在浏览器中准备就绪时，为什么以下 JQuery 触发的事件正在运行.我对 JQuery 的经验很少，所以我对此很执着.

Why is the following JQuery triggered event running when the document becomes ready in the browser. I have very little experience with JQuery so I am kinda stuck with this one.

    <head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
</head>
<form name="f1" id="f1">Input:
    <input list="br" name="b" id="b">
    <datalist id="br">
        <option value="10">
            <option value="11">
                <option value="12">
                    <option value="100">
                        <option value="101">
    </datalist>
</form>
<br>
<fieldset>
    <legend id="result"></legend>
</fieldset>

<script>
$("#b")
    .change(function () {
    var str = $('#b').val();
    $("#result").text(str);

    $.get("cgi-bin/something.cgi?s=" + str, function (data) {
        $("body")
            .append("Name: " + data.name) 
        .append("Time: " + data.time);
    }, "json");
    alert("Load was performed.");
})
    .change();
</script>

如果您还可以告诉我，为什么要指出"cgi-bin/something.cgi?s ="+ str为什么在 Get 请求中不包含var str 的原因呢?预先感谢您的帮助.

Bonus points if you can also tell me why "cgi-bin/something.cgi?s=" + str is not including var str in the Get request. Thanks in advance for the help.

答

change()事件是在加载时触发的，因为它是在没有参数的情况下调用的.您的代码的极为简化的版本如下所示:

The change() event is triggered on load because it's being called without an argument. An extremely simplified version of your code looks like this:

$("#b").change(function(){ /*do stuff*/ }).change();

这可能会造成混淆，因为 change()函数充当处理程序或触发器，具体取决于传递参数的方式(请参阅文档

This can be confusing because the change() function acts as either a handler or a trigger, depending on how an argument is passed (see docs here).

只需删除多余的 change()调用即可解决问题.

Simply removing the extra change() call should do the trick.

jQuery更改事件在页面加载时触发输入

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