jQuery框架源码解读

1.jQuery 1.9.1

 parseJSON: function( data ) {
         // Attempt to parse using the native JSON parser first
         if ( window.JSON && window.JSON.parse ) {
             return window.JSON.parse( data );
         }

         if ( data === null ) {
             return data;
         }

         if ( typeof data === "string" ) {

             // Make sure leading/trailing whitespace is removed (IE can't handle it)
             data = jQuery.trim( data );

             if ( data ) {
                 // Make sure the incoming data is actual JSON
                 // Logic borrowed from http://json.org/json2.js
                 if ( rvalidchars.test( data.replace( rvalidescape, "@" )
                     .replace( rvalidtokens, "]" )
                     .replace( rvalidbraces, "")) ) {

                     return ( new Function( "return " + data ) )();
                 }
             }
         }

         jQuery.error( "Invalid JSON: " + data );
     },