把类数组转化为数组
- 类数组转化为数组1 : Array.prototype.slice.call(arguments) || Array.prototype.slice.apply(arguments)
//从索引开始出提取数组
var test = function() {
return Array.prototype.slice.call(arguments) ; //es5
}
let a = test(1,2,3,4)
console.log(a) // [1, 2, 3, 4]
//例二:
var test = function() {
return Array.prototype.slice.apply(arguments) ; //es5
}
let a = test(1,2,3,4)
console.log(a) // [1, 2, 3, 4]
- 类数组转化为数组2 : [].slice.call(arguments)
var test = function() {
return [].slice.call(arguments) ; //es5
}
let a = test(1,2,3,4)
console.log(a) // [1, 2, 3, 4]
- 类数组转化为数组3:Function.prototype.call.bind(Array.prototype.slice)
var unboundSlice = Array.prototype.slice;
var slice = Function.prototype.call.bind(unboundSlice);
function test() {
return slice(arguments);
}
var a = test(1, 2, 3,4);
console.log(a)// [1, 2, 3, 4]
- 类数组转化为数组4:[].concat.apply([],arguments)
var test = function(){
return [].concat.apply([],arguments)
}
var a = test(1,2,3,4);
console.log(a) //[1,2,3,4]
- ES6类数组转化为数组 Array.from(arr)
var test = function(){
return Array.from(arguments)
}
var a = test(1,2,3,4) ;
console.log(a) //[1,2,3,4]
function combine(){
let arr = [].concat.apply([], arguments); //没有去重复的新数组
return Array.from(new Set(arr));
}
var m = [1, 2, 2], n = [2,3,3];
console.log(combine(m,n));