getCachedScript.js

jQuery.getCachedScript = function(url,callback){
    
    jQuery.ajax({
        dataType: "script",
        cache: true,
        url: url,
        success:callback
    });

};

jQuery.getCachedScript(_spPageContextInfo.webAbsoluteUrl+"/_layouts/15/sp.runtime.js",function(){
    
    console.log("sp.runtime.js loaded");
    
    jQuery.getCachedScript(_spPageContextInfo.webAbsoluteUrl+"/_layouts/15/sp.js",function(){
        
        console.log("sp.js loaded");
    
    });
});