为何长尾词在SEO中如此重要？

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javascript(function($) { $.alerts={ alert: function(title, message, callback) { if (title==null) title='Alert'; $.alerts._show(title, message, null, 'alert', function(result) { if (callback) callback(result); }); }, confirm: function(title, message, callback) { $.alerts._show(title, message, null, 'confirm', function(result) { if (callback) callback(result); }); }, _show: function(title, msg, stay, type, callback) { // Code to show the alert or confirm dialog } };})();

js实现代码

(function($) { $.alerts = { alert: function(title, message, callback) { if( title == null ) title = 'Alert'; $.alerts._show(title, message, null, 'alert', function(result) { if( callback ) callback(result); }); }, confirm: function(title, message, callback) { if( title == null ) title = 'Confirm'; $.alerts._show(title, message, null, 'confirm', function(result) { if( callback ) callback(result); }); }, _show: function(title, msg, value, type, callback) { var _html = ""; _html += ' ' + title + ''; _html += ' ' + msg + ' '; if (type == "alert") { _html += ' '; } if (type == "confirm") { _html += ' '; _html += ' '; } _html += ' '; //必须先将_html添加到body，再设置Css样式 $("body").append(_html); GenerateCss(); switch( type ) { case 'alert': $("#mb_btn_ok").click( function() { $.alerts._hide(); callback(true); }); $("#mb_btn_ok").focus().keypress( function(e) { if( e.keyCode == 13 || e.keyCode == 27 ) $("#mb_btn_ok").trigger('click'); }); break; case 'confirm': $("#mb_btn_ok").click( function() { $.alerts._hide(); if( callback ) callback(true); }); $("#mb_btn_no").click( function() { $.alerts._hide(); if( callback ) callback(false); }); $("#mb_btn_no").focus(); $("#mb_btn_ok, #mb_btn_no").keypress( function(e) { if( e.keyCode == 13 ) $("#mb_btn_ok").trigger('click'); if( e.keyCode == 27 ) $("#mb_btn_no").trigger('click'); }); break; } }, _hide: function() { $("#mb_box,#mb_con").remove(); } } // Shortuct functions zdalert = function(title, message, callback) { $.alerts.alert(title, message, callback); } zdconfirm = function(title, message, callback) { $.alerts.confirm(title, message, callback); }; //生成Css var GenerateCss = function () { $("#mb_box").css({ width: '100%', height: '100%', zIndex: '99999', position: 'fixed', filter: 'Alpha(opacity=60)', backgroundColor: 'black', top: '0', left: '0', opacity: '0.6' }); $("#mb_con").css({ zIndex: '999999', width: '50%', position: 'fixed', backgroundColor: 'White', borderRadius: '15px' }); $("#mb_tit").css({ display: 'block', fontSize: '14px', color: '#444', padding: '10px 15px', backgroundColor: '#DDD', borderRadius: '15px 15px 0 0', borderBottom: '3px solid #009BFE', fontWeight: 'bold' }); $("#mb_msg").css({ padding: '20px', lineHeight: '20px', borderBottom: '1px dashed #DDD', fontSize: '13px' }); $("#mb_ico").css({ display: 'block', position: 'absolute', right: '10px', top: '9px', border: '1px solid Gray', width: '18px', height: '18px', textAlign: 'center', lineHeight: '16px', cursor: 'pointer', borderRadius: '12px', fontFamily: '微软雅黑' }); $("#mb_btnbox").css({ margin: '15px 0 10px 0', textAlign: 'center' }); $("#mb_btn_ok,#mb_btn_no").css({ width: '85px', height: '30px', color: 'white', border: 'none' }); $("#mb_btn_ok").css({ backgroundColor: '#168bbb' }); $("#mb_btn_no").css({ backgroundColor: 'gray', marginLeft: '20px' }); //右上角关闭按钮hover样式 $("#mb_ico").hover(function () { $(this).css({ backgroundColor: 'Red', color: 'White' }); }, function () { $(this).css({ backgroundColor: '#DDD', color: 'black' }); }); var _widht = document.documentElement.clientWidth; //屏幕宽 var _height = document.documentElement.clientHeight; //屏幕高 var boxWidth = $("#mb_con").width(); var boxHeight = $("#mb_con").height(); //让提示框居中 $("#mb_con").css({ top: (_height - boxHeight) / 2 + "px", left: (_widht - boxWidth) / 2 + "px" }); } })(jQuery); 测试代码实现

样式一 样式二