原文链接：http://www.cnblogs.com/henw/archive/2011/12/19/2293585.html
需求：自定义一个弹出登陆框的界面，主要特点有隐藏hide()，显示show()，浏览器窗口改变大小触发事件resize(),计算屏幕居中位置等功能。
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//设置物体居中Base.prototype.center=function(width,height){
var top=(document.documentElement.clientHeight-height)/2;
var left=(document.documentElement.clientWidth-width)/2;
for(var i=0;i<this.elements.length;i++){
this.elements[i].style.top=top+'px';
this.elements[i].style.left=left+'px';
}
return this;
}//当浏览器改变窗口大小的时候，触发事件Base.prototype.resize=function(){
window.onresize=fn;
return this;
}/*前台调用var login=$().getId('login');//登录框login.center(350,250).resize(function(){ login.center(350,250);
});//弹出登录框$().getClass('login').click(function(){ login.css('display','block');
});//登录框关闭按钮$().getClass('close').click(function(){ login.css('display','none');
});*/ |
基础库：
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//前台调用var $ = function (_this) {
return new Base(_this);
}//基础库function Base(_this) {
//创建一个数组，来保存获取的节点和节点数组
this.elements = [];
if (_this != undefined) { //_this是一个对象，undefined也是一个对象，区别与typeof返回的带单引号的'undefined'
this.elements[0] = _this;
}
}//获取ID节点Base.prototype.getId = function (id) {
this.elements.push(document.getElementById(id));
return this;
};//获取元素节点数组Base.prototype.getTagName = function (tag) {
var tags = document.getElementsByTagName(tag);
for (var i = 0; i < tags.length; i ++) {
this.elements.push(tags[i]);
}
return this;
};//获取CLASS节点数组Base.prototype.getClass = function (className, idName) {
var node = null;
if (arguments.length == 2) {
node = document.getElementById(idName);
} else {
node = document;
}
var all = node.getElementsByTagName('*');
for (var i = 0; i < all.length; i ++) {
if (all[i].className == className) {
this.elements.push(all[i]);
}
}
return this;
}//获取某一个节点Base.prototype.getElement = function (num) {
var element = this.elements[num];
this.elements = [];
this.elements[0] = element;
return this;
};//设置CSSBase.prototype.css = function (attr, value) {
for (var i = 0; i < this.elements.length; i ++) {
if (arguments.length == 1) {
if (typeof window.getComputedStyle != 'undefined') {//W3C
return window.getComputedStyle(this.elements[i], null)[attr];
} else if (typeof this.elements[i].currentStyle != 'undeinfed') {//IE
return this.elements[i].currentStyle[attr];
}
}
this.elements[i].style[attr] = value;
}
return this;
}//添加ClassBase.prototype.addClass = function (className) {
for (var i = 0; i < this.elements.length; i ++) {
if (!this.elements[i].className.match(new RegExp('(\s|^)' +className +'(\s|$)'))) {
this.elements[i].className += ' ' + className;
}
}
return this;
}//移除ClassBase.prototype.removeClass = function (className) {
for (var i = 0; i < this.elements.length; i ++) {
if (this.elements[i].className.match(new RegExp('(\s|^)' +className +'(\s|$)'))) {
this.elements[i].className = this.elements[i].className.replace(new RegExp('(\s|^)' +className +'(\s|$)'), ' ');
}
}
return this;
}//添加link或style的CSS规则Base.prototype.addRule = function (num, selectorText, cssText, position) {
var sheet = document.styleSheets[num];
if (typeof sheet.insertRule != 'undefined') {//W3C
sheet.insertRule(selectorText + '{' + cssText + '}', position);
} else if (typeof sheet.addRule != 'undefined') {//IE
sheet.addRule(selectorText, cssText, position);
}
return this;
}//移除link或style的CSS规则Base.prototype.removeRule = function (num, index) {
var sheet = document.styleSheets[num];
if (typeof sheet.deleteRule != 'undefined') {//W3C
sheet.deleteRule(index);
} else if (typeof sheet.removeRule != 'undefined') {//IE
sheet.removeRule(index);
}
return this;
}//设置innerHTMLBase.prototype.html = function (str) {
for (var i = 0; i < this.elements.length; i ++) {
if (arguments.length == 0) {
return this.elements[i].innerHTML;
}
this.elements[i].innerHTML = str;
}
return this;
}//设置鼠标移入移出方法Base.prototype.hover = function (over, out) {
for (var i = 0; i < this.elements.length; i ++) {
this.elements[i].onmouseover = over;
this.elements[i].onmouseout = out;
}
return this;
};//设置显示Base.prototype.show = function () {
for (var i = 0; i < this.elements.length; i ++) {
this.elements[i].style.display = 'block';
}
return this;
}//设置隐藏Base.prototype.hide = function () {
for (var i = 0; i < this.elements.length; i ++) {
this.elements[i].style.display = 'none';
}
return this;
}//设置物体居中Base.prototype.center = function (width, height) {
var top = (document.documentElement.clientHeight - height) / 2;
var left = (document.documentElement.clientWidth - width) / 2;
for (var i = 0; i < this.elements.length; i ++) {
this.elements[i].style.top = top + 'px';
this.elements[i].style.left = left + 'px';
}
return this;
}//触发点击事件Base.prototype.click = function (fn) {
for (var i = 0; i < this.elements.length; i ++) {
this.elements[i].onclick = fn;
}
return this;
}//触发浏览器窗口事件Base.prototype.resize = function (fn) {
window.onresize = fn;
return this;
}
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本文转自 小旭依然 51CTO博客，原文链接:http://blog.51cto.com/xuyran/1886527