/**
?*?Created?by?ycx?on?2017/4/6.
?*/
;(function?()?{
???'use?strict';
???var?$oDiv?=?$('.block');
???console.log($oDiv);

???$oDiv.onmouseover?=?function?()?{
??????startMove(0);
???}
???$oDiv.onmouseout?=?function?()?{
??????startMove(-200);
???}
???var?timer?=?null;
???function?startMove(target)?{
??????clearInterval(timer);
??????var?$oDiv?=?$('.block');
??????var?speed?=?0;
??????if?($oDiv.offsetLeft?>?target)?{
?????????speed?=?-10;
??????}
??????else?{
?????????speed?=?10;
??????}
??????timer?=?setInterval(function?()?{
?????????if?($oDiv.offsetLeft?==?target)?{
????????????clearInterval(timer);
?????????}
?????????else?{
????????????$oDiv.style.left?=?$oDiv.offsetLeft?+?speed?+?'px';
?????????}
??????},?30)
???}

})();

在選擇器var $oDiv = $('.block');這里就報錯沒有$()這個方法，懷疑是引用的問題，但是不管是npm安裝jquery，還是直接引用cdn，都不行，到底是什么原因??？？

<script?src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script?src="base.js"></script>

<script?src="node_modules/jquery/dist/jquery.js"></script>
<script?src="base.js"></script>