数组元素反转

元素反转

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数组元素反转;

• 方法一:

var arr = [1, 2, 3, 4, 5]
for (let i = 0; i < arr.length / 2; i++) {
    
    
  const temp = arr[i]
  arr[i] = arr[arr.length - 1 - i]
  arr[arr.length - 1 - i] = temp
}
console.log(arr);

• 方法二;

var arr = [1, 2, 3, 4, 5]
arr.reverse()
console.log(arr);

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字符串元素反转:

var arr = 'abc'
arr = arr.split('').reverse().join('')
console.log(arr);