旋转JavaScript中数组中的元素

类型安全的通用版本，可更改数组：

Array.prototype.rotate = (function() {    // save references to array functions to make lookup faster    var push = Array.prototype.push,        splice = Array.prototype.splice;    return function(count) {        var len = this.length >>> 0, // convert to uint count = count >> 0; // convert to int        // convert count to value in range [0, len)        count = ((count % len) + len) % len;        // use splice.call() instead of this.splice() to make function generic        push.apply(this, splice.call(this, 0, count));        return this;    };})();

在评论中，Jean提出了代码不支持

push()

splice()

push.apply(this, splice.call(this, 0, count));

与此：

(this.push || push).apply(this, (this.splice || splice).call(this, 0, count));

在Opera 10中，使用

unshift()

push()

Array.prototype.rotate = (function() {    var unshift = Array.prototype.unshift,        splice = Array.prototype.splice;    return function(count) {        var len = this.length >>> 0, count = count >> 0;        unshift.apply(this, splice.call(this, count % len, len));        return this;    };})();