js基础 数组splice

var arr = [1,2,3,4,5];
var hd = arr.splice(0,3);
console.log(hd);
 ]
console.log(arr);
 ]

 

 

 

var arr = [1,2,3,4,5];
var hd = arr.splice(0,3,"ss","aa");
console.log(hd);
 ]
console.log(arr);
 ]