数组相关操作

数组相关操作

var arr = ['ming','女','20','160']

console.log(arr);

//push()插入
 var res = arr.push('200');

 console.log(res);
 console.log(arr);

 //在数组前面插入元素
 var arr2 = ['a','b','c','d'];
 console.log(arr2);
 arr2.unshift('1');
 console.log(arr2);

  //删除最后面一个元素
 var res1 = arr2.pop();
 console.log(arr2);
  
  //删除第一个元素
 var res2 = arr2.shift();
 console.log(arr2);