A K

for( var i = 11; 0 <= i; i-- ){
    answer[i].classList.remove("faq__item-answer-show");
}

$.ajax({
    crossDomain: true,
    type:"GET",
    contentType: "application/json; charset=utf-8",
    async:false,
    url: "http://<your domain>/hello",
    data: {projectID:1},
    dataType: "jsonp",                
    jsonpCallback: 'successCallback'
});

.rotate360 {
    transition: transform 1s;
    transform: rotate(360deg);
}

sessionStorage['myPage'] = 'myValue';
console.log(sessionStorage['myPage']);