李炎恢老师JavaScript第一季视频教程

var $ = function () {
return new Base();
}

function Base() {

//创建一个数组，来保存获取的节点和节点数组
this.elements = [];

//获取ID节点
this.getId = function (id) {
this.elements.push(document.getElementById(id));
return this;
};

//获取元素节点
this.getTagName = function (tag) {
var tags = document.getElementsByTagName(tag);
for (var i = 0; i < tags.length; i ++) {
this.elements.push(tags[i]);
}
return this;
};

}

Base.prototype.css = function (attr, value) {
for (var i = 0; i < this.elements.length; i ++) {
this.elements[i].style[attr] = value;
}
return this;
}

Base.prototype.html = function (str) {
for (var i = 0; i < this.elements.length; i ++) {
this.elements[i].innerHTML = str;
}
return this;
}

Base.prototype.click = function (fn) {
for (var i = 0; i < this.elements.length; i ++) {
this.elements[i].onclick = fn;
}
return this;
}