代码如下:
/**
* 加载js文件
* @param {string || array} url js路径
* @param {Function} fn 加载完成后回调
* @return {object} game对象
* @example
* getScript("url.js",fn)
* getScript(["url-1.js","url-2.js"],fn)
*/
game.getScript = (function() {
var cache = {};//内部缓存下url,下次则不请求
return function(url, fn) {
if ("string" === typeof(url)) {
url = [url]; //如果不是数组带个套
};
var i = 0,//循环起
ok = 0,//加载成功几个js
len = url.length,//一共几个js
head = document.getElementsByTagName("head")[0],
js, _url,
create = function(url) {//创建js
js = document.createElement("script");
js.type = "text/javascript";
js.src = url;
head.appendChild(js);
return js;
};
for (; i < len;) {
if (cache[encodeURIComponent((_url = url[i++]))]) {//如果加载过
(++ok >= len && fn) && fn();//如果加载完所有的js则执行回调
continue;
}
cache[encodeURIComponent(_url)] = !0;//设置缓存
js = create(_url);//创建js
fn && (js.onload = function() {
if (++ok >= len) {//如果加载完所有的js则执行回调
fn();
}
});
};
head = js = _url = create = null;
return this;
}
})();
