'why not get expected result by the addEventListener method in javascript

output is "PointerEvent {isTrusted: true, pointerId: 1, width: 1, height: 1, pressure: 0, …}",it is not expected the expected result is "li".
please help,thanks.

 <script type="text/javascript">
        function elementCheckChange(eve)
        {
            console.log(eve);
        }
        function init() 
        {
            var root=document.getElementById("container");
            console.log(root)
            for(var i =0;i<3;i++)
            {
                var sub_ele=document.createElement("li");
                sub_ele.innerHTML=i;
                sub_ele.addEventListener("click",elementCheckChange.bind(this));
                root.appendChild(sub_ele);
            }
        }
</script>
<body onload="init()">
    <ul id="container">
    </ul>
</body>
addeventlistener


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