[object 对象] 是什么意思? [英] What does [object Object] mean?

问题描述

我试图提醒一个函数的返回值，我在提醒中得到了这个:

I am trying to alert a returned value from a function and I get this in the alert:

[object Object]  

这是 JavaScript 代码:

Here is the JavaScript code:

<script type="text/javascript">
$(function ()
{
    var $main = $('#main'),
    $1 = $('#1'),
    $2 = $('#2');

    $2.hide(); // hide div#2 when the page is loaded

    $main.click(function ()
    {
        $1.toggle();
        $2.toggle();
    });

    $('#senddvd').click(function ()
    {
       alert('hello');
       var a=whichIsVisible();
       alert(whichIsVisible());
    });

    function whichIsVisible()
    {
        if (!$1.is(':hidden')) return $1;
        if (!$2.is(':hidden')) return $2;
    }

});

</script>

whichIsVisible 是我要检查的函数.

推荐答案

从对象到字符串的默认转换是"[object Object]".

The default conversion from an object to string is "[object Object]".

当您处理 jQuery 对象时，您可能想要这样做

As you are dealing with jQuery objects, you might want to do

alert(whichIsVisible()[0].id);

打印元素的 ID.

如评论中所述，您应该使用 Firefox 或 Chrome 等浏览器中包含的工具通过执行 console.log(whichIsVisible()) 而不是 alert 来内省对象>.

As mentioned in the comments, you should use the tools included in browsers like Firefox or Chrome to introspect objects by doing console.log(whichIsVisible()) instead of alert.

旁注:ID 不应以数字开头.

Sidenote: IDs should not start with digits.

这篇关于[object 对象] 是什么意思?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！