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@ ① Asynchronous API Synchronization API: synchronization tasks are executed on the main thread to form an execution stack. The next API can only be executed after the execution of the current API is completed console.log('before'); console.log('after'); /*Output results *, Asynchronous API: the execution of the current API will not block the ...

1. What is a watcher The watcher is a mediator that notifies it when data changes, and then it notifies others. For the watcher, see an example of using it: //keypath vm.$watch('a,b,c', function(newVal, oldVal){ //do something } ) This code represents data a. When the B.C attribute changes, the function in the second parameter is trigg ...

This topic aims to share some interesting or valuable topics found in the process of brushing Leecode. [answer based on js, of course].Recursive algorithm has always been one of the key types of leetcode medium difficulty exercises, so the key is self-evident.Topic relatedOriginal address: https://leetcode-cn.com/problems/dui-cheng-de-er-cha-sh ...

Basic part of golang: Go cannot download and install git plug-in because the ip address of go agent cannot be accessed. You can change the following address: Proxy is used by default golang. Org, not accessible at home  go>go get -u github.com/go-sql-driver/mysql  go>go env -w GOPROXY=https://goproxy.cn goweb part: Four link ...

Look at the renderings first 1, Foreword Party A has to export well and use excel for advanced screening. It has to implement one in the web page.... The initial attempt to use the official screening of element is very different from that of excel after showing it to Party A.. Fortunately, the official provides a custom header, so you ...

1, JavaScript overview: 1. JavaScript is a scripting language that runs on browsers. JS for short.JavaScript was developed by Brandon Archie of NetScape (the father of JavaScript), originally called LiveScript.The emergence of LiveScript makes the browser more vivid and no longer a simple static page. Pages are more interactive.At some stage i ...

Declaration array Array is a collection of multiple variable values. Array is an instance of array object, so you can call methods like objects. Create array Creating arrays using object mode console.log(new Array(1, 'wgchen', 'willem')); // [1, 'wgchen', 'willem'] Using literal creation is a simple recommended practice const array = ...

regular expression establish Creation method Method 1: use the constructor to create. The syntax is new regexp (regular expression, matching pattern). The specific of this method is flexible and can pass variables, but it is cumbersome to use const str = '1234 abcd' let reg reg = new RegExp(/\d/, 'g') console.log(str.match(reg)) // [ ...

Chapter 1 native AJAX Introduction to AJAX The full name of AJAX is asynchronous JavaScript and XML, which is the JS and XML of asynchronous requests. Through AJAX, you can send asynchronous requests to the server in the browser. The biggest advantage is to obtain data without refresh AJAX is not a new programming language, but a new w ...

array Create array Create an array with new var arr1 = new Array();//An empty array was created Creating arrays with array literals var arr2 = [];//An empty array was created var arr3 = [1,'2','kalise',true]; Because the second is simple, the second is usually used Accessing array elements var arr3 ...