默认排序字段为0 (该如何设计呢)
从小到大排序
拖动排序的时候如何进行逻辑上变更
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默认排序字段为0 (该如何设计呢)
从小到大排序
拖动排序的时候如何进行逻辑上变更
这个,比如图片列表,三张图片,一般是数据库里有一个字段用来表示图片顺序,比如ord,你从数据库中读取图片的时候order by ord desc。
前端排序的时候,假如你用dragsort,那么每次拖动排序完毕后,都会触发一个js事件,那么在这个时间的回调函数里执行ajax请求,更新这个图片们的ord值的就行了,而这些ord值,前端排序空间会返回给你的,一般文档会提供的。
详情请参考jquery.dragsort.js,凭借三年前曾做过的印象,好像是这么一回事。
<code>order by sort_num asc, update_timestamp asc</code>
位置交换啊....
c=a
a=b
b=c
你问的是这个么...

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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

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PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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