// 输出 0 - 9
function test() {
    var arr = [];
    for (var i = 0; i < 10; i++) {
        arr[i] = function() {
            console.log(i);
        }
    }
    return arr;
}
var myArr = test();

for(var j = 0; j < 10; j++) {
    myArr[j]();
    // 输出 10个10
}

// 可以用let 来解决。把 var 改为 let 输出 0 1 2 3 4 5 6 7 8 9 10;

// 闭包解决
function test() {
    ar arr = [];
    for (var i = 0; i < 10; i++) {
        (function (j) {
            arr[j] = function () {
                console.log(j);
            }
         }(i))    // 每次运行时 i被保存到了 j
     }
     return arr;
}
var myArr = test();
for (var j = 0; j < 10; j++) {
    myArr[j]();
    // 输出 0-9
}

function test() {
    var food = 'apple';
    var obj = {
        eatFood: function () {
            if(food !='') {
                console.log('i am eating ' + food);
                food = '';
            }
            else {
                console.log('There is nothing! ');
            }
        },
        pushFood: function (myFood) {
            food = myFood;
        }
    }
    return obj;
}

var person = test();
person.eatFood();
person.eatFood();
person.pushFood('banana');
person.eatFood();