shruDemo.js

({
    handleClick : function(component, event, helper) {
        let pageReference = {
            type: 'standard__navItemPage',
            attributes: {
                apiName: 'MYVFPAGE'     
            },
            state: {
                caseNumber: 'jAR'
                
            }  
        };
        var navService = component.find("navService");
        navService.generateUrl(pageReference)
            .then($A.getCallback(function(url) {
                 console.log('Using Navigate'+url);
                navService.navigate(pageReference);
               
               //window.open(url);
 
               
            }), $A.getCallback(function(error) {
               	console.log(error); 
            }));
    }
})