Examples of efficient methods for converting Json strings into JS objects_javascript skills

// 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 );
}
}

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);