单击btn_add2后，如何从函数外部访问itemid变量
$(document).ready(function(){
$(document).on("click", ".btn_add2", function () {
var itemid= $(this).attr('data-asset-group-id');
console.log('test1:' + itemid);
});
console.log('test2:' + itemid); // how to access to variable itemid from here?
});
您应该在点击事件之外定义项目变量，如下所示
<script>
$(document).ready(function(){
var item = $("#item").text()
$("#btn").click(function(){
alert("item in click" + item);
});
alert(item)
});
</script>
</head>
<body>
<span id="item">TEST</span>
<button id="btn"> click this </button>