javascript es6 引數擴充套件
阿新 • • 發佈：2018-11-28
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>es6</title> </head> <body> <h2> ES6 </h2> <script> function sum (x, y, z) { let total = 0; if (x) total += x; if (y) total += y; if (z) total += z; console.log(`total: ${total}`) } sum(8,'', 10) function sums (...m) { let total = 0; for (let i of m) { total += i; } console.log(`total: ${total}`); } sums(4, 8, 9, 10); let sum3 = (...m) => { let total = 0; for (let i of m) { total += i; } console.log(`total: ${total}`); }; sum3(100, 200, 300); console.log(...[4, 9, 10, 5, 6]); // 合併 let arr1 = [1, 3]; let arr2 = [2, 4]; console.log(`output: ${arr1.concat(arr2)}`); console.log([...arr1, ...arr2]); let [x, ...y] = [10, 20, 30]; console.log(x);// 10 console.log(y);// [20, 30] let [...a] = 'es6'; console.log(a); //["e", "s", "6"] </script> </body> </html>