카카오 자바스크립트 SDK 비동기로드 asynchronously load Kakao Javascript SDK

gistfile1.js

window.kakaoAsyncInit = function() {
    Kakao.init('your-javascript-key');
};
(function(d, s, id){
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) {return;}
    js = d.createElement(s); js.id = id;
    js.src = "https://developers.kakao.com/sdk/js/kakao.min.js";
    var done = false;
    js.onload = js.onreadystatechange = function() {
        if ( !done && (!this.readyState || this.readyState === "loaded" || this.readyState === "complete") ) {
            done = true;
            if(typeof window.kakaoAsyncInit === 'function') {
                window.kakaoAsyncInit();
            }
            // Handle memory leak in IE
            js.onload = js.onreadystatechange = null;
            if ( fjs && js.parentNode ) {
                fjs.parentNode.removeChild( js );
            }
        }
    }
    fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'kakao-jssdk'));