Programmer Think

Common browsers webkit kernel (v8) engine google chrome safariopera(v14)Domestic browserMobile phone browser... Gecko Firefox Firefox presto opera <v14 Trident IEIe edge (starting with dual core) JS as client language Operate the elements in the page according to the relevant syntax, and sometimes operate the browserECMAS ...

Deconstruction assignment of array Basic Usage ES6 allows you to extract values from arrays and objects and assign values to variables according to a certain pattern, which is called deconstructing. es5 declares multiple variables at once var a = 1, b = 2, c = 3, ...; es6 declares multiple variables at once let [a,b,c] = [1, ...

catalog: 1,Event mechanism concept 2,Method of registering event listening 3,Event operation 4,Bubbling and trapping 1. Event mechanismProblem Description:1) How does the event mechanism work? How is it different from the event loop mechanism?Answer:Event mechanism is different from event loop. It is user interaction level and depends on event ...

Assignment 1 The following functions are implemented as required and tested: Implement a join function, which can connect the parameters according to the specified characters. Function name: join. Parameters: s (symbol), SRC1 (character 1), src2 (character 2) Return value: string after connection function join(s,src1,src2){ ///Self re ...

Numerical extension Number.isFinite(),Number.isNaN() ES6 provides a new Number on the Number object Isfinish() and Number Isnan() two methods. Number. Isfinish () is used to check whether a value is finite. Number.isFinite(15); // true Number.isFinite(0.8); // true Number.isFinite(NaN); // false Number.isFinite(Infinity); // false Number.is ...

1, The value of the formal parameter is determined by the argument passed in when the function is called //Previous writing function add(x, y) { if (typeof x == "undefined") { x = 1 } if (typeof y == "undefined") { y = 1 } return x + y; ...

Vue3 learning journey – falling in love with vue3 – vue3 basic grammar (II) – template grammar Continued: Vue3 learning journey – meet vue3 - learn about vue3 Vue3 learning journey – meet vue3 - know vue3 (II) Vue3 learning journey – falling in love with vue3 – vue3 basic syntax (I) – and basic ...

1, New syntax for ES6 Let: the variables declared by let are valid only at the block level Variables declared with the let keyword have block level scope. Variables declared with var do not have block level scope. <script> if (true) { let b = 20; console.log(b); // 20 } console.log(b); // b is not ...

1, Basic grammar 1. let command (1) Declare variable let a; Declare variables and assign values (variable initialization) let a = 100; console.log(a); // 100 (2) Note: ① Variable cannot be declared repeatedly let star = 'ldh'; let star = 'zxy'; console.log(star); // Will report an error ② Written in a code block {} is ca ...

1, The concept of Iterator Meaning: Iterator is an interface that provides a unified access mechanism for various data structures. Any data structure can complete the operation of traversing all members of the data structure as long as the Iterator interface is deployed. The data structure with native Iterator interface is as follows: Ar ...