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声明以下数组元素 let arr = 通过reverse可以让数组元素颠倒过,来如下效果 let s = arr.reverse(function (v) { ...
有如下数组 let arr = 1.要截取从关羽到最后一位：通过下标截取，关羽的下标是1，就可以通过指定下标截取 let s = arr.slice(1) 结果 ...
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> &l...
代码 <!DOCTYPE html> <html lang="en"> <head> <meta charset="U...
代码 <!DOCTYPE html> <html> <head> <meta charset="utf-8"> ...
<!DOCTYPE html> <html> <head> <meta charset="utf-8">...
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"&...
let obj = {name: 'John', age: 30, city: 'New York'}; let count = 0; for (let key in obj)...
