<script type="text/javascript">

layui.use(['layer'], function(){

$ = layui.juqery;

  layer = layui.layer;

# });

function dologin(){

var username = $('#username').val();

var pwd = $('#pwd').val();

var verifycode = $( '#verifycode').val();

if (username == '') {

layer.alert('請輸入使用者名稱',{icon:2});

return;

}

if (pwd == '') {

layer.alert('請輸入密碼',{icon:2} );

return;

}

if (verifycode == '') {

layer.alert('請輸入驗證碼',{ icon:2});

return;

}

}

< ;/script>

錯誤：Uncaught TypeError: $ is not a function