地球村🌏の質問

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5 months ago

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質問

Vertically aligning CSS :before and :after content

I am trying to centre the link with the image, but can't seem to move the content vertically in any way.<h4>More Information</h4> <a href="#" class="pdf">File Name</a>The icon is 22 x 22px.pdf { font-size: 12px; } .pdf:before { padding:0 5px 0 0; content: url(../img/icon/pdf_small.png); } .pdf:after { content: " ( .pdf )"; font-size: 10px; } .pdf:hover:after { color: #000; }

202

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2 months ago

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質問

[antd: Message] You are calling notice in render which will break in React 18 concurrent mode. Please trigger in effect instead.

I'm getting this error when using MessageWarning: [antd: Message] You are calling notice in render which will break in React 18 concurrent mode. Please trigger in effect instead.Here is my code:import { message } from 'antd'; export default function Page() { const [messageApi, contextHolder] = message.useMessage(); const res = await fetch("/api/...", { method: "POST", }); if (!res.ok) { messageApi.error("Error! Fail to login!"); } return ( <Home> ...

137

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a month ago

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質問

Django将已经存在的字段改为外键

我有一个Django模型，它之前是这样的class Car(models.Model): manufacturer_id = models.IntegerField()然后还有另一个名为Manufacturer的模型，id字段所指的就是它。然而，后来我意识到使用Django自带的外键功能，会更方便。因此，我将这个模型改为现在这样class Car(models.Model): manufacturer = models.ForeignKey(Manufacturer)这次修改似乎一下就弄好了，查询出来的结果也没有任何报错，但是当我试着运行数据迁移的时候，Django输出了以下结果- Remove field manufacturer_id from car - Add field manufacturer to car执行这个迁移会清除所有已经存在于数据库里的关系，所以我并不想这么做。我其实并不想做任何的迁移，毕竟像Car.objects.get(manufacturer__name="Toyota")这样的查询没有一点问题。我更想要一个恰当的数据库外键限制，但不是高优 ...

django-migrations

96

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a month ago

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質問

JSON Parse报错: Unterminated string

我在JSON parse函数中使用转义引号时，遇到了一个常见的问题。如果存在转义引号，在本例中为“test”，则会导致以下错误'SyntaxError: JSON Parse error: Unterminated string'.var information = JSON.parse('[{"-1":"24","0":"","1":"","2":"","3":"0.0000","4":"","5":"0.00","6":"0.00","7":"1.00","8":"0","9":"false","10":"false","11":[""],"12":"","13":"","14":"test\""}]');JSON Lint验证该JSON为有效的。

90

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