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<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('請輸入用戶名',{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>

報錯：Uncaught TypeError: $ is not a function