reduce实现map
2020-07-12 本文已影响0人
Time_Notes
Array.prototype.map = function (callback) {
var arr = this;
return arr.reduce((acc, cur, i) => {
acc.push(callback(cur, i, arr));
return acc
}, []);
}
var m = [1,2,3,4,54].map(function (v, i, arr) {
return v * v
});
console.log(m)
