Search form in portfolio web site

Design help Custom code
11

$(function () {

	var filterList = {
   
	
	
		init: function () {
		
			// MixItUp plugin
			// http://mixitup.io
			$('#portfoliolist').mixItUp({
			selectors: {
			  target: '.portfolio',
			  filter: '.filter'	
		  },
		  load: {
  		  filter: '.app'  
  		}     
			});								
		
		}

	};
	
	// Run the show!
	filterList.init();
	
	
});

I want to create function to search inside my site

I know I have to do something in js file