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(function() {
var Set = (function() {
var add = function(item) {
var i, data = this._data;
for (i = 0; i < data.length; i++) {
if (data[i] === item) {
return;
}
}
this.size ++;
data.push(item);
return data;
};
var Set = function(data) {
this.size = 0;
this._data = [];
var i;
if (data.length > 0) {
for (i = 0; i < data.length; i++) {
add.call(this, data[i]);
}
}
};
Set.prototype.add = add;
Set.prototype.get = function(index) { return this._data[index]; };
Set.prototype.has = function(item) {
var i, data = this._data;
for (i = 0; i < data.length; i++) {
if (this.get(i) === item) {
return true;
}
}
return false;
};
Set.prototype.is = function(map) {
if (map._data.length !== this._data.length) { return false; }
var i, j, flag, tData = this._data, mData = map._data;
for (i = 0; i < tData.length; i++) {
for (flag = false, j = 0; j < mData.length; j++) {
if (tData[i] === mData[j]) {
flag = true;
break;
}
}
if (!flag) { return false; }
}
return true;
};
Set.prototype.values = function() {
return this._data;
};
return Set;
})();
window.Lazyload = (function(doc) {
var queue = {js: [], css: []}, sources = {js: {}, css: {}}, context = this;
var createNode = function(name, attrs) {
var node = doc.createElement(name), attr;
for (attr in attrs) {
if (attrs.hasOwnProperty(attr)) {
node.setAttribute(attr, attrs[attr]);
}
}
return node;
};
var end = function(type, url) {
var s, q, qi, cbs, i, j, cur, val, flag;
if (type === 'js' || type ==='css') {
s = sources[type], q = queue[type];
s[url] = true;
for (i = 0; i < q.length; i++) {
cur = q[i];
if (cur.urls.has(url)) {
qi = cur, val = qi.urls.values();
qi && (cbs = qi.callbacks);
for (flag = true, j = 0; j < val.length; j++) {
cur = val[j];
if (!s[cur]) {
flag = false;
}
}
if (flag && cbs && cbs.length > 0) {
for (j = 0; j < cbs.length; j++) {
cbs[j].call(context);
}
qi.load = true;
}
}
}
}
};
var load = function(type, urls, callback) {
var s, q, qi, node, i, cur,
_urls = typeof urls === 'string' ? new Set([urls]) : new Set(urls), val, url;
if (type === 'js' || type ==='css') {
s = sources[type], q = queue[type];
for (i = 0; i < q.length; i++) {
cur = q[i];
if (_urls.is(cur.urls)) {
qi = cur;
break;
}
}
val = _urls.values();
if (qi) {
callback && (qi.load || qi.callbacks.push(callback));
callback && (qi.load && callback());
} else {
q.push({
urls: _urls,
callbacks: callback ? [callback] : [],
load: false
});
for (i = 0; i < val.length; i++) {
node = null, url = val[i];
if (s[url] === undefined) {
(type === 'js' ) && (node = createNode('script', { src: url }));
(type === 'css') && (node = createNode('link', { rel: 'stylesheet', href: url }));
if (node) {
node.onload = (function(type, url) {
return function() {
end(type, url);
};
})(type, url);
(doc.head || doc.body).appendChild(node);
s[url] = false;
}
}
}
}
}
};
return {
js: function(url, callback) {
load('js', url, callback);
},
css: function(url, callback) {
load('css', url, callback);
}
};
})(this.document);
})();
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