Tag：Difference
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Time：2020-1-26
When you write code, you often confuse these two attributes. Whether it’s a href or a SRC is a reference to hypertext,For elements such as link and aOn, the href is a reference and page Association, which establishes a relationship between the current element and the reference resource. The SRC is a reference resource, which […]
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Time：2020-1-21
Analysis of price difference between sap mm purchase order and related contracts In my project, the price of general production material Po comes from the contract price, while the contract price comes from the price recorded in the purchase information. The business department does not allow the Po to change the price casually. […]
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Time：2020-1-16
In the previous essay, in a nostalgic manner, I summarized a method of building XHR objects compatible with different browsers: After the XHR object is established, what the client needs to do is to pass the data to the server in some way to get the corresponding response. Here, in the second quarter of Ajax […]
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Time：2020-1-9
In the project code, we often see some old drivers write like this in the if judgment: if (null = = a), and I write if (a = = null) because of my habit. What’s the difference between the two? In fact, there is no difference between the two, but the former deals with details. […]
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Time：2020-1-7
For example, name = John. In the queue, values and forms are separated by a & sign, spaces are replaced by a + sign, and special symbols are converted into hexadecimal code. Because this queue is in the URL, the parameters of the queue can be seen, recorded, or changed. Usually get methods also limit […]
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Time：2020-1-4
Webpack is the most detailedWhen weex meets vue.js 2.0Building super large web application with Vue and vuexHow webgl & three.js worksWhat are the main differences between react JS and react nativeThe new CSS workflow (step 1)Reactive UI’s with VanillaJS – Part 1: Pure Functional Style
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Time：2020-1-1
If this:HOT100 series of leadcode — 62. Different paths — simple dynamic planning If you understand, the question is basically the same,The differences are:1. Here, each path is equivalent to one more weight2. The conclusion is no longer fixed, but to compare which weight is smaller in different walking methods For the first point, the […]
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Time：2019-12-31
There are seven restful routing verbs by default (index, show, create, new, edit, update, destroy). Sometimes we need to customize the route, and then we need to use the: on parameter. : the on parameter has three values: collection, member, and new. If you want to add a route in member mode, you can do […]
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Time：2019-12-30
1. Explain the concept of generics first Generics are a new feature of Java se 1.5. The essence of generics is parameterized type, that is, the data type being operated is specified as a parameter. This parameter type can be used in the creation of classes, interfaces and methods, which are called generic classes, generic […]
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Time：2019-12-19
concept Transformation Used to generate a new RDD from an existing RDD. RDD graph system, become RDD operation graph or RDD dependency graph. Is the logical execution plan, DAG with and without cycles, Transformation is lazy execution and is only executed when the action is executed. classification According to the change of data set size […]
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Time：2019-12-6
Mongodb is more similar to MySQL, and supports field index and cursor operations. Its advantage lies in its powerful query function. It is good at querying JSON data and storing massive data, but does not support transactions. MySQL’s efficiency is significantly reduced when there is a large amount of data. Mongodb is more often used […]
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Time：2019-11-27
In the rule engine, Ruby’s closures are frequently used, and there are block, proc and lambda, which are confusing. In order to understand the code in depth, I have learned the similarities and differences of ruby closures again, especially the usage of block, proc and lambda. This week’s notes will share my experience with you. […]
