ES6 splice() 数组方法

var arr = ["orange", "mango", "banana", "sugar", "tea"];  
var removed = arr.splice(2, 0, "water");  
console.log("After adding 1: " + arr );  
console.log("removed is: " + removed);

removed = arr.splice(3, 1);  
console.log("After adding 1: " + arr );  
console.log("removed is: " + removed);