let myArray=[11,22,33];
    console.log('原数组：',myArray);
    myArray.push(44,55);
    console.log('用push在数组后面插入元素：',myArray);
    myArray.unshift(66,77);
    console.log('用unshift在数组前面插入元素：',myArray);
    myArray.splice(2,0,'肾虚少年');
    console.log('用splice在数组指定位置插入元素：',myArray);