关于jquery $.browser 报错问题

(function(jQuery){ ????if(jQuery.browser) return; ????jQuery.browser = {}; ??jQuery.browser.mozilla = false; ??jQuery.browser.webkit = false; ??jQuery.browser.opera = false; ??jQuery.browser.msie = false; ????var nAgt = navigator.userAgent; ??jQuery.browser.name = navigator.appName; ??jQuery.browser.fullVersion = ‘‘+parseFloat(navigator.appVersion); ??jQuery.browser.majorVersion = parseInt(navigator.appVersion,10); ??var nameOffset,verOffset,ix; ????// In Opera, the true version is after "Opera" or after "Version" ??if ((verOffset=nAgt.indexOf("Opera"))!=-1) { ??jQuery.browser.opera = true; ??jQuery.browser.name = "Opera"; ??jQuery.browser.fullVersion = nAgt.substring(verOffset+6); ??if ((verOffset=nAgt.indexOf("Version"))!=-1) ??jQuery.browser.fullVersion = nAgt.substring(verOffset+8); ??} ??// In MSIE, the true version is after "MSIE" in userAgent ??else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) { ??jQuery.browser.msie = true; ??jQuery.browser.name = "Microsoft Internet Explorer"; ??jQuery.browser.fullVersion = nAgt.substring(verOffset+5); ??} ??// In Chrome, the true version is after "Chrome" ??else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) { ??jQuery.browser.webkit = true; ??jQuery.browser.name = "Chrome"; ??jQuery.browser.fullVersion = nAgt.substring(verOffset+7); ??} ??// In Safari, the true version is after "Safari" or after "Version" ??else if ((verOffset=nAgt.indexOf("Safari"))!=-1) { ??jQuery.browser.webkit = true; ??jQuery.browser.name = "Safari"; ??jQuery.browser.fullVersion = nAgt.substring(verOffset+7); ??if ((verOffset=nAgt.indexOf("Version"))!=-1) ??jQuery.browser.fullVersion = nAgt.substring(verOffset+8); ??} ??// In Firefox, the true version is after "Firefox" ??else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) { ??jQuery.browser.mozilla = true; ??jQuery.browser.name = "Firefox"; ??jQuery.browser.fullVersion = nAgt.substring(verOffset+8); ??} ??// In most other browsers, "name/version" is at the end of userAgent ??else if ( (nameOffset=nAgt.lastIndexOf(‘ ‘)+1) < ??(verOffset=nAgt.lastIndexOf(‘/‘)) ) ??{ ??jQuery.browser.name = nAgt.substring(nameOffset,verOffset); ??jQuery.browser.fullVersion = nAgt.substring(verOffset+1); ??if (jQuery.browser.name.toLowerCase()==jQuery.browser.name.toUpperCase()) { ??jQuery.browser.name = navigator.appName; ??} ??} ??// trim the fullVersion string at semicolon/space if present ??if ((ix=jQuery.browser.fullVersion.indexOf(";"))!=-1) ??jQuery.browser.fullVersion=jQuery.browser.fullVersion.substring(0,ix); ??if ((ix=jQuery.browser.fullVersion.indexOf(" "))!=-1) ??jQuery.browser.fullVersion=jQuery.browser.fullVersion.substring(0,ix); ????jQuery.browser.majorVersion = parseInt(‘‘+jQuery.browser.fullVersion,10); ??if (isNaN(jQuery.browser.majorVersion)) { ??jQuery.browser.fullVersion = ‘‘+parseFloat(navigator.appVersion); ??jQuery.browser.majorVersion = parseInt(navigator.appVersion,10); ??} ??jQuery.browser.version = jQuery.browser.majorVersion; ??})(jQuery); ??