自写图片遮罩层放大功能jquery插件源码，photobox.js 1.0版，不兼容IE6

浏览数：15 / 时间：2015年06月09日

阿嚏~~~

话说本屌丝没啥开发插件的经验，但是天公不作美，公司需要让我自己开发个图片放大的插件

但公司老大的话，犹如吾皇之圣旨，微臣必当肝脑涂地，莫敢不从啊~~~

于是乎，作为一个超级小白，本人只能瞎研究了，幸好黑天不负屌丝人，本屌丝终于搞出来了，虽然不尽善尽美，但是功能还是可以用的啦

先附上源码，求各种大神指导：

/*******************************
 * photobox跨浏览器兼容插件 v1.0（不支持IE6）
 * 格式：<a href="big.jpg" id="b1" title="我就是一坨屎，你来咬我啊！"><img src="small.jpg"></a>///$("#b1").photobox();
 *******************************/
;(function($){
    $.fn.photobox = function(options){
		var opts = $.extend({}, $.fn.photobox.defaults, options);//整合参数
		return this.each(function(){
			$(this).click(function(){
				if(opts.showshadow){//如果设置显示阴影遮罩层，则显示
					$.fn.photobox.shadow(opts.shadowOptions);
				}
				if(opts.showbox){//如果设置显示图片边框，则显示
					$.fn.photobox.box();
				}
				if(opts.showclosebtn){//如果设置显示关闭按钮，则显示
					$.fn.photobox.closebtn();
				}
				var $this = $(this);
				var imgSrc = $this.attr("href");
				var title = $this.attr("title");
				var bigImg = new Image();//用js来获取图片高度和宽度
				bigImg.src = imgSrc;
				var h = bigImg.height;
				var w = bigImg.width;
				var $bigphoto = $('<img src="'+imgSrc+'" rel="photobox">');
				var wh = $(window).height();
				var ww = $(window).width();
				$bigphoto.css({
					"width":"0px" , 
					"height":"0px",
					"z-index":"10000",
					"opacity":0
				});
				$("#pb_box").append($bigphoto);
				if(opts.showtitle){//显示title
					$.fn.photobox.title(title);
				}

				//大家一起show
				$("#boxshadow").stop(true).fadeIn(opts.speed);
				var title_h = 0;
				title_h = opts.showtitle ? 20 : 0 ;
				$("#pb_box").stop(true).animate({
					"width":w+"px",
					"height":h+title_h+"px",
					"top":parseInt((wh-h-title_h)/2)+"px",
					"left":parseInt((ww-w)/2)+"px",
					"opacity":1
				},opts.speed);
				if(opts.showclosebtn){
					$("#pb_closebtn").stop(true).animate({
						"width":"31px",
						"height":"32px",
						"opacity":1
					},opts.speed);
				}
				$bigphoto.stop(true).animate({
					"width":w+"px",
					"height":h+"px",
					"opacity":1
				},opts.speed);
				if(opts.showtitle){
					$("#pb_phototitle").stop(true).animate({
						"height":"20px",
						"width":w+"px",
						"opacity":1
					},opts.speed);
				}
				$.fn.photobox.close();
				$.fn.photobox.resize();
				return false;//防止a标签跳转
			});
		}); 
    };
	$.fn.photobox.shadow = function(options){//添加背景阴影遮罩层
		var shadowOptions = {"width":"100%","height":"100%","position":"fixed","top":"0","left":"0","display":"none"};
		var $boxshadow=$('<div></div>');
		$boxshadow.attr({"id":"boxshadow"});
		$boxshadow.css(shadowOptions);
		$boxshadow.css(options);
		$("body").append($boxshadow);
	};
	$.fn.photobox.box = function(){
		var wh = $(window).height();
		var ww = $(window).width();
		var $box = $('<div></div>');//包裹图片的div
		$box.attr({"id":"pb_box"});
		$box.css({"background-color": "#fff","padding": "10px","position": "fixed","opacity": "0","width": "0px","height":" 0px","top": parseInt(wh/2)+"px","left":parseInt(ww/2)+"px","z-index":10000});
		$("body").append($box);
	};
	$.fn.photobox.closebtn = function(){//图片关闭按钮
		var $close = $('<a></a>');//关闭按钮
		$close.attr({"id":"pb_closebtn"});
		$close.css({"background": "url('css/web/images/close.png')","position": "absolute","opacity": "0","width": "0px","height":" 0px","top": "-15px","right":"-15px","z-index":10000});
		$("#pb_box").append($close);
	};
	$.fn.photobox.title = function(title){
		var $title = $('<span></span>');//图片title
		$title.attr({"id":"pb_phototitle"});
		$title.css({"line-height":"20px","color":"#1e2024","text-align":"center"});
		$title.html(title);
		$("img[rel='photobox']").after($title);
	};
	$.fn.photobox.close = function(){
		$("#boxshadow,#pb_closebtn").click(function(){
			var wh = $(window).height();
			var ww = $(window).width();
			$("#boxshadow").fadeOut($.fn.photobox.defaults.speed,function(){
				$(this).remove();
			});
			$("#pb_box").animate({
				"width":"20px",
				"height":"20px",
				"top":parseInt(wh/2)+"px",
				"left":parseInt(ww/2)+"px",
				"opacity":0
			},$.fn.photobox.defaults.speed,function(){
				$(this).remove();
			});
			$("img[rel='photobox']").animate({
				"width":"0px",
				"height":"0px",
				"opacity":0
			},$.fn.photobox.defaults.speed,function(){
				$(this).remove();
			});
			if(opts.showclosebtn){//如果设置显示关闭按钮
				$("#pb_closebtn").stop(true).animate({
					"width":"0px",
					"height":"0px",
					"opacity":0
				},$.fn.photobox.defaults.speed,function(){
					$(this).remove();
				});
			}
			if(opts.showtitle){
				$("#pb_phototitle").stop(true).animate({
					"height":"0px",
					"width":"0px",
					"opacity":0
				},$.fn.photobox.defaults.speed,function(){
					$(this).remove();
				});
			}
		});
	};
	
	$.fn.photobox.resize = function(){
		$(window).resize(function(){
			if($("body").has($("#pb_box"))){
				var wh = $(window).height();
				var ww = $(window).width();
				var h = $("#pb_box").height();
				var w = $("#pb_box").width();
				$("#pb_box").stop(true).animate({
					'top':(wh-h)/2 +'px',
					'left':(ww-w)/2 +'px'
				},100);
			}
		});
	};
	
	$.fn.photobox.defaults = {
		showclosebtn:true,
		showtitle:true,
		speed:400,
		//以下参数暂时不允许用户修改
		showshadow:true,
		showbox:true,
		showoverlay:true,//此功能暂未开放
		shadowOptions:{ "background-color": "#000", "opacity": 0.6 , "z-index": 9999},//遮罩层的zIndex要小于图片层的zIndex
		autoresize:true
	};
})(jQuery);

附张效果图：