小弟刚学JS
在弄一个弹窗层的代码
在网上找到了一个挺好的效果..
就是有些复杂看不懂啊
求加注释。解释每个函数干什么用的
(越详细越好啊..)^_^
代码在 弹出层
小弟分不多了..努力弄分中..
结果发到这个邮箱里吧
------解决方案--------------------
- JScript code
/** * 当id是字符串的时候,根据ID获取指定的元素。否则直接返回id */ function $(id){ return typeof id === "string" ? document.getElementById(id) : id; } /** *根据父元素以及指定的节点名称获取节点集合(这里是元素标签的名称) *oParent:指定父元素,如果未指定,默认为document,oParent || document "或(||)":意思是前面如果不存在或者省略了,则取后面的document, *elem:节点的名称,比如div,span,p等 * 返回元素集合 * 比如:$$($('aaa'),'span');获取id为aaa下面的span元素集合 */ function $$(oParent, elem){ return (oParent || document).getElementsByTagName(elem); } /** * 根据父元素以及指定的类名获取节点集合(注意这里是class的名称) * oParent 父元素,这里调用了上面的方法,其余解释同上 */ function $$$(oParent, sClass){ var aElem = $$(oParent, '*'); var aClass = []; var i = 0; for(i=0;i<aElem.length;i++)if(aElem[i].className == sClass)aClass.push(aElem[i]); return aClass; } /** * 这里其实就是调用这个Alert类的initialize方法,Alert是一个对象,javascript里面,函数也是对象 * 在prototype里面有的,apply是借用某个方法的意思, * 也就是说直接执行某个方法,前面是指定当前上下文对象,这里就是本对象,arguments是参数 */ function Alert(){ this.initialize.apply(this, arguments); } /** * 这里是对象的拷贝而已,将一个对象复制给另一个对象而已,跟jquery版本的extend类似,jquery复杂的多 * 简单点说就是吧source对象里面的属性直接复制给destination对象 * destination:是目标对象 * source:源对象 * */ Object.extend = function(destination, source){ for (var property in source) { destination[property] = source[property]; } return destination; }; /** * 这个就是Alert对象了,里面有initialize方法,自己看吧。其余的应该不要解释了。 */ Alert.prototype = { //初始化 initialize : function(obj, frame, onEnd){ if($(obj)){ var _this = this; this.obj = $(obj); this.frame = frame; this.oEve(onEnd); this.oTitle = this.onEnd.title; this.oContent = this.onEnd.content; this.iWidth = this.onEnd.width; this.iHeight = this.onEnd.height; this.iTop = this.onEnd.top; this.iLeft = this.onEnd.left; this.iFixed = this.onEnd.fixed; this.iClose = this.onEnd.close; this.obj.onclick = function(){_this.create(),_this.backg();}; window.onresize = function(){_this.backg();}; } }, //创建对话框的一些基本元素 create : function(){ //csdn内容限制长度,内容我删除了,你自己对着看... }, oEve: function(onEnd){ this.onEnd = {}; Object.extend(this.onEnd, onEnd || {}); }, //赋值内容,就是对话框里面的内容 content : function(){ this.conent = $$$(this.tit, 'alert_con')[0]; this.conent == undefined ? this.con.innerHTML = this.oContent : this.conent.innerHTML = this.oContent; this.oButton = $$(this.tit, 'button'); var i = 0; var _this = this; for(i=0;i<this.oButton.length;i++)this.oButton[i].onclick = function(){_this.em.onclick()}; }, //计算宽度 width : function(){ }, //计算对话框高度 height : function(){ if(this.iHeight != ""){ this.oFrame.style.height = parseInt(this.iHeight) +'px'; this.oFrame.style.marginTop = -parseInt(this.iHeight) / 2 +'px'; this.oCon.style.height = parseInt(this.iHeight) - 10 +'px'; this.oAlert_con.style.height = parseInt(this.iHeight) - 40 +'px'; } }, //计算对话框距离顶部的距离,居中 top : function(){ if(this.iTop != "")this.oFrame.style.top = parseInt(this.iTop) +'px',this.oFrame.style.marginTop = 0; }, //计算对话框距离左边的距离,居中 left : function(){ if(this.iLeft != "")this.oFrame.style.left = parseInt(this.iLeft) +'px',this.oFrame.style.marginLeft = 0; }, backg : function(){ this.oScrollHeight = document.documentElement.scrollHeight || document.body.scrollHeight; this.oScrollWidth = document.documentElement.scrollWidth || document.body.scrollWidth; this.oBackg.style.width = document.documentElement.clientWidth + (this.oScrollWidth - document.documentElement.clientWidth) +'px' this.oBackg.style.height = document.documentElement.clientHeight + (this.oScrollHeight - document.documentElement.clientHeight) +'px' }, fixed : function(){ if(this.iFixed == "fixed"){//固定对话框,需要考虑IE6的固定,因为不兼容fixed var _this = this; this.oFrame.style.position = 'fixed'; this.oAlert_tit.style.cursor = 'move'; this.oAlert_tit.onmousedown = function(e){ var _thisE = this; this.oEvent = e || event; this.X = this.oEvent.clientX - _this.oFrame.offsetLeft; this.Y = this.oEvent.clientY - _this.oFrame.offsetTop; document.onmousemove = function(e){ this.oEvent = e || event; this.L = this.oEvent.clientX - _thisE.X; this.T = this.oEvent.clientY - _thisE.Y; if(this.L < 0){ this.L = 0; }else if(this.L > document.documentElement.clientWidth - _this.oFrame.offsetWidth){ this.L = document.documentElement.clientWidth - _this.oFrame.offsetWidth } if(this.T < 0){ this.T = 0; }else if(this.T > document.documentElement.clientHeight - _this.oFrame.offsetHeight){ this.T = document.documentElement.clientHeight - _this.oFrame.offsetHeight; } _this.oFrame.style.left = this.L + 'px'; _this.oFrame.style.top = this.T + 'px'; _this.oFrame.style.margin = 0; return false; } document.onmouseup = function(){ document.onmouseup = null; document.onmousemove = null; }; return false; }; if(this.oFrame){ if(!-[1,] && !window.XMLHttpRequest){ //这里是修复IE6固定问题,因为fixed在IE6无法固定的 document.documentElement.style.textOverflow = "ellipsis"; this.oFrame.style.position = "absolute"; this.oFrame.style.setExpression("top", "eval(documentElement.scrollTop + " + this.oFrame.offsetTop + ') + "px"'); } } } }, //对话框关闭操作 close : function(){ }, //获取某个元素的css样式 getStyle : function(obj, attr) { return obj.currentStyle?obj.currentStyle[attr]:getComputedStyle(obj, false)[attr]; }, //拖动 sMove : function(obj, json, onEnd){ }, //拖动 dMove : function(obj, json, onEnd){ } }; //元素加载完成之后,new 一个Alert对象 window.onload = function(){ new Alert('but', 'box', { title : '提示内容', content : '<div class="size">确定不在关注新浪微博?</div><div class="but"><button class="button">确定</button><button class="button">取消</button></div>', width : '', height : '', top : '', left : '', fixed : '', close : 'close' }); };