forEach语法:
arr.forEach(function(value, index, array){……})
实例:
// forEach
var arr = [,,,,];
arr.forEach(function(value, index, array){
array[index] *= ;
});
console.log(arr); //[2,4,6,8,10]
map语法:
var newArr = arr.map(function(value, index, array){return 要放入新数组的值})
实例:
// map
var arr = [,,,,];
var newArr = arr.map(function(value, index, array){
return value * ;
});
console.log(arr); // [1,2,3,4,5]
console.log(newArr); // [2,4,6,8,10]