最简单的jquery模拟alert的弹窗插件

插件代码，将样式集成进去了    

(function ($) {
	$.extend({
		_isalert:0,
		alert:function(){
			if(arguments.length){
				$._isalert=1;
				$.confirm.apply($,arguments);
			}
		},
		confirm:function(){
			var args=arguments;
			if(args.length&&(typeof args[0] == 'string')&&!$('#alert_overlay').length){
				if(!$('#alert_style').length) $('body').append('<style id="alert_style" type="text/css">#alert_overlay{position:fixed;width:100%;height:100%;top:0;left:0;z-index:999;background:#000;filter:alpha(opacity=5);opacity:.05}#alert_msg{position:fixed;width:400px;margin-left:-201px;left:50%;top:20%;z-index:1000;border:1px solid #aaa;box-shadow:0 2px 15px rgba(0,0,0,.3);background:#fff}#alert_content{padding:20px;font-size:14px;text-align:left}#alert_buttons{padding:10px;border-top:1px solid #aaa;text-align:right;box-shadow:0 1px 0 #fff inset;background:#eee;-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none}#alert_buttons .alert_btn{padding:5px 12px;margin:0 2px;border:1px solid #aaa;background:#eee;cursor:pointer;border-radius:2px;font-size:14px;outline:0;-webkit-appearance:none}#alert_buttons .alert_btn:hover{border-color:#bbb;box-shadow:0 1px 2px #aaa;background:#eaeaea}#alert_buttons .alert_btn:active{box-shadow:0 1px 2px #aaa inset;background:#e6e6e6}</style>');
				var dialog=$('<div id="alert_overlay"></div><div id="alert_msg"><div id="alert_content">'+args[0]+'</div><div id="alert_buttons"><button class="alert_btn alert_btn_ok">确定</button><button class="alert_btn alert_btn_cancel">取消</button></div></div>');
				if($._isalert) dialog.find('.alert_btn_cancel').hide();
				dialog.on('contextmenu',function(){
					return !1;
				}).on('click','.alert_btn_ok',function(){
					dialog.remove()&&(typeof args[1]=='function')&&args[1].call($,!0);
				}).on('click','.alert_btn_cancel',function(){
					dialog.remove()&&(typeof args[1]=='function')&&args[1].call($,!1);
				}).appendTo('body');
			}
			$._isalert=0;
		}
	});
})($);

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