Question

我有这样一份名单;

var mystrings = [
     apple ,
     banana ,
     orange 
]

I would like a function I can call at anytime to get the next string. And when the end of the list is reached, start over and get the first one again.

我将这份清单用于必须按名单顺序排列的科安科课程清单,但是,如果需要的话,我不会坐在名单上。

I can t figure it out and it is somehow hard to google. Any ideas?

Answer 1

这里的职能很少:

function enumerator(array) {
    var index = 0;
    return function () {
        return array[index++%array.length]
    }

}

呼吁:

var next = enumerator(["a", "b"]);
next(); // a
next(); // b
next(); // a

Answer 2

// Your array is declared in global scope
var mystrings = [
     apple ,
     banana ,
     orange 
];

// A global index variable...
var strIndex = 0;
function getNextString() {
   // If you reached the end of the array, reset to 0
   if (strIndex === mystrings.length - 1) {
       strIndex = 0;
       return mystrings[strIndex];
   }
   // Otherwise, increment it and return the new value
   else return mystrings[++strIndex];
}

// Call it as
var currentString = getNextString();

Answer 3

采用外部指数变量和增减,或将其重新编为每打1美元

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