JavaScript Fundamentals – Part 2
2022/8/31 14:23:48
本文主要是介绍JavaScript Fundamentals – Part 2,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
Functions(函数)
function logger() { console.log('My name is Shubham'); } // calling / running / invoking function(调用/运行/调用函数 ) logger(); //My name is Shubham logger(); //My name is Shubham function fruitProcessor(apples, oranges) { const juice = `Juice with ${apples} apples and ${oranges} oranges.`; return juice; } const appleJuice = fruitProcessor(5, 0); console.log(appleJuice); //Juice with 20 piece of apple and 0 pieces of orange. const appleOrangeJuice = fruitProcessor(2, 4); console.log(appleOrangeJuice); //Juice with 8 piece of apple and 16 pieces of orange. const num = Number('23'); console.log(num); //23
Function Declarations vs. Expressions(函数声明 vs 函数表达式)
Function Declarations
function calcAge1(birthYeah) { return 2021 - birthYeah; } const age1 = calcAge1(1999); console.log(age1); //22
Function expression
const calcAge2 = function (birthYeah) { return 2021 - birthYeah; } const age2 = calcAge2(1999); console.log(age2); //22
Arrow functions(箭头函数)
const calcAge3 = birthYeah => 2021 - birthYeah; const age3 = calcAge3(1999); console.log(age3); //22 const yearsUntilRetirement = (birthYeah, firstName) => { const age = 2021 - birthYeah; const retirement = 60 - age; // return retirement; return `${firstName} retires in ${retirement} years`; } console.log(yearsUntilRetirement(1991, 'Jonas')); //Jonas retires in 30 years console.log(yearsUntilRetirement(1980, 'Bob')); //Bob retires in 19 years
Functions Calling Other Functions(调用其他函数的函数)
function cutFruitPieces(fruit) { return fruit * 4; } function fruitProcessor(apples, oranges) { const applePieces = cutFruitPieces(apples); const orangePieces = cutFruitPieces(oranges); const juice = `Juice with ${applePieces} piece of apple and ${orangePieces} pieces of orange.`; return juice; } console.log(fruitProcessor(2, 3)); //Juice with 8 piece of apple and 12 pieces of orange.
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