Tag：Character string
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Time：2019-12-8
In this paper, an example is given to illustrate the conversion operation of C ා date format strings. To share with you for your reference, as follows: Method 1: convert.todatetime (string) String format is required, it must be yyyy MM DD HH: mm: SS Method 2: convert.todatetime (string, iformatprovider) DateTime dt; DateTimeFormatInfo dtFormat = new […]
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Time：2019-12-7
reference material: https://ask.csdn.net/questions/767017 https://www.cnblogs.com/best-fyx/p/11363506.html I use the upload component in element UI. The final effect is Method of binding on progress event corresponding to component handleProgressing(event, file, fileList) { // console.log(event) // console.log(event.loaded)//total var per = event.loaded * 100 / event.total var size = event.total / 1024 / 1024 this.step = 2.77 this.timeSpan = […]
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Time：2019-12-6
The two field values of Oracle database are comma separated strings, for example, the value of field a is “1,2,3,5”, and the value of field B is “2”. To get the intersection (same value) 2 of two fields, get the difference (difference value) 1,3,5 of two fields. I. the final SQL statement 1. Get intersection […]
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Time：2019-12-4
Written in front Original address: https://www.bram.us/2019/11/25/faster-javascript-apps-with-json-parse/ The original text contains the video of oil pipe. If you have a ladder and good English, you can click the link to watch it. For readers who are too long to read becauseJSONGrammatical ratioJavascriptThe syntax of is simpler, so parsingJSONRatio analysisJavascriptMore efficient. When a web app needs to […]
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Time：2019-12-4
The example of this paper describes the string to array operation implemented by JavaScript. To share with you for your reference, as follows: <!DOCTYPE html> <html lang=”en”> <head> <meta charset=”UTF-8″> < title > www.jb51.net string to array < / Title > <script> var str=”abcdefg” //1. Convert string to array form: split() var arr=str.split(“”) console.log(arr)//[“a”, “b”, […]
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Time：2019-12-2
I. expression of verification number Number: ^ [0-9]$ N digits: ^ \ D {n}$ At least n digits: ^ \ D {n,}$ M-N digits: ^ \ D {m, n}$ Zero and non-zero digits: ^ (0| [1-9] [0-9])$ The number with two decimals at most at the beginning of non-zero: ^ ([1-9] [0-9]) + (. [0-9] […]
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Time：2019-11-30
Decorator What is a decorator? Decorator is a function, mainly used to wrap another function or class The purpose of the wrapper is to change or add the function of the wrapped object without changing the original function name (or class name) Function decorator Decorator is a function, passed in is a function, returned is […]
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Time：2019-11-26
Since I have always been a front-end engineer, I will make an analogy between the JSON operation in JS and the operation in go from the perspective of front-end to facilitate your understanding. Convert string to object js : JSON.parse(`{“name”:”cfl”}`)go : json.Unmarshal jsonStr := `{ “name”:”cfl”, “age”:10, “friend”:[{“name”:”sx”, “age”:10 }] }` type User struct { […]
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Time：2019-11-24
1. String extension Unicode – \u0000 ~ \uFFFF ‘\{u0061}’ // a ‘\uD842\uDfB7’ “\u{20BB7}” // “𠮷” String traverser – recognition greater than 0xFFFF let text2 = String.fromCodePoint(0x20BB7); for(let i = 0;i < text2.length;i++){ console.log(text2[i]); } // � // � for (let i of text){ console.log(i); } // “𠮷” Template string – keep all spaces and line […]
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Time：2019-11-22
Python basic variables mainly include character type and numerical type. Compared with numerical type data, character type data can be understood as a kind of text, which is more widely used in the field of language. Python’s string data type is unchangeable, so when creating a variable whose type is string, the character of the […]
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Time：2019-11-22
Find the contained string in the current file Find. – name “*. TXT” | xargs grep ‘ABC’, for example: find the string containing string a in the txt file
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Time：2019-11-21
I. increase document.cookie = cname + “=” + cvalue + “;expires=” + expires + “;path=/”; // respectively //CNAME is the key of cookie //Cvalue is the value of cookie directly connected with key = //Expires is used before the expiration time of the cookie; connected to cvalue //The scope with path as Cookie defaults to […]
