parseJSON: function( data ) {   if ( typeof data !== "string" || !data ) {    return null;   }   // Make sure leading/trailing whitespace is removed (IE can't handle it)   data = jQuery.trim( data );   // Make sure the incoming data is actual JSON   // Logic borrowed from http://json.org/json2.js   if ( /^[/],:{}/s]*$/.test(data.replace(///(?:["////bfnrt]|u[0-9a-fA-F]{4})/g, "@")    .replace(/"[^"///n/r]*"|true|false|null|-?/d+(?:/./d*)?(?:[eE][+/-]?/d+)?/g, "]")    .replace(/(?:^|:|,)(?:/s*/[)+/g, "")) ) {    // Try to use the native JSON parser first    return window.JSON && window.JSON.parse ?     window.JSON.parse( data ) :     (new Function("return " + data))();   } else {    jQuery.error( "Invalid JSON: " + data );   }  }

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

var jsonStr ="{"; for(var i=0;i<10000;i++){  jsonStr+="a"+i+":"+i+"," } jsonStr = jsonStr.substring(0,jsonStr.length-1); jsonStr+="}"; var date = new Date(); var start = date.getTime() //var boj = (new Function("return "+jsonStr ))(); var boj = eval("("+jsonStr+")"); var date1 = new Date(); console.info(date1.getTime()-start);