Programmer Think

1. Introduction of Data Acquisition Tools Most of the dynamic websites are now launched by the browser through js ajax requests, get the data and then render to complete the page display. In this case, it is not feasible to collect data, initiate http get request through script, and parse and extract useful data after getting the DOM document p ...

Offline Usually, you may find that your user base is not on the grid most of the time. Maps SDK allows you to download and store pre-selected areas for use when the device is offline. The result of downloading the map is to use style, tile and other resources in the download area to generate fully func ...

Preface PS: These are just personal learning, only for the reference of ideas, may be defective, and are tested in chrome, not necessarily applicable to other browsers, and do not consider IE, remember!! PS: 2008/03/23 was revised, the style was reformed, and some new methods and principles were introduced. It is suggested to know the basic kno ...

Editor: HBuiderX, PyCharm Main technologies: 5+App, python HBuiderX Download Address: http://www.dcloud.io/hbuilderx.html PyCharm Download Address: http://www.jetbrains.com/pycharm/?fromMenu python download address: https://www.python.org/ 5+App is a cross-platform app project under HBuiderX. T ...

Express inquiry API interface uses the logistics number to query the logistics information.Mainly used in e-commerce stores, ERP systems, WMS systems, express cabinets, banks and other enterprises.Several express logistics companies have unified interface access. It is recommended that docking interface providers can access more than one expre ...

Before learning about the implementation of Curator distributed locks, it is recommended that steps be taken: Implementation of Distributed Lock Based on ZooKeeper To understand the implementation principle of ZooKeeper API distributed lock. Based on ZooKeeper distributed lock implementation, there ...

File upload is to get the temporary path of the file to be uploaded and move it to the corresponding folder under the server. File upload, must be written in the form tag in the form: enctype="multipart/form-data" to upload the file, upload the file using the file field, the code is < input type = "file" name = "fil ...

Java emoji persistence mysqlI haven't updated my blog for a long time. Today I share with you a question about emoji expression persistence. I believe that web developers have encountered such a problem, because we know that MySQL utf-8 character set can't save emoji expression characters. Why? Because ordinary strings or expressions occupy 3 b ...

My understanding of casbin This paper takes the iris framework as an example, and the native or other framework is basically the same. according to Official Documents First of all, introduce several important parts.(Installation method skip) There are two places to configure using casbin, one is the model and the other is the policy RBAC (Role- ...

1. Preparing documents Go to DCloud website by yourself: http://dcloud.io/ Download the official IDE Hbuilder and create an empty uniapp project. uniapp framework comes with optimized vue, we only need to prepare the following three files: Bootstrap.min.css//bootstrap 4 or more. https://unpkg.com/bootstrap@4.3.1/dist/css/bootstrap.min.css boots ...