Javascript Random Key Generator

function js_random_key_generator(length) {
 var result = '';
 var characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
 var charactersLength = characters.length;
 for ( var i = 0; i < length; i++ ) {
 result += characters.charAt(Math.floor(Math.random() * 
 charactersLength));
 }
 return result;
}

console.log(js_random_key_generator(10));