Javascript动态创建Divs

这是一个简单的javascript代码。我在脚本中创建了5个div，并为每个div填充一个"onclick"事件。然而，他们都给了我最后一个的id。知道为什么会发生这种行为吗？非常感谢。

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Test Page</title>
<style type="text/css">
.divImgPoint {
float: left;
border-radius: 50%;
width: 15px;
height: 15px;
margin-left: 5px;
margin-right: 5px;
border: ridge 2px #c73756;
}
.divTest {
position: absolute;
width: 100px;
height: 100px;
top: 200px;
left: 100px;
border: 1px solid red;
}
</style>
<script type="text/javascript">
function createNewDivs() {
var divFixed = document.getElementById('divFixed');
var newDiv;
for (xI = 0; xI < 5; xI++) {
newDiv = document.createElement('div');
newDiv.id = "newDiv_" + xI;
newDiv.className = "divImgPoint";
newDiv.onclick = () => { alert(newDiv.id + " | " + xI); }
divFixed.appendChild(newDiv);
}
}
</script>
</head>
<body>
<div id="divFixed">
</div>
</body>
</html>
<script type="text/javascript">
window.addEventListener('load', () => { createNewDivs(); });
</script>

将let newDiv;放入循环中。

像

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Test Page</title>
<style type="text/css">
.divImgPoint {
float: left;
border-radius: 50%;
width: 15px;
height: 15px;
margin-left: 5px;
margin-right: 5px;
border: ridge 2px #c73756;
}
.divTest {
position: absolute;
width: 100px;
height: 100px;
top: 200px;
left: 100px;
border: 1px solid red;
}
</style>
<script type="text/javascript">
function createNewDivs() {
var divFixed = document.getElementById('divFixed');

for (xI = 0; xI < 5; xI++) {
let newDiv;
newDiv = document.createElement('div');
newDiv.id = "newDiv_" + xI;
newDiv.className = "divImgPoint";
newDiv.onclick = () => { alert(newDiv.id + " | " + xI); }
divFixed.appendChild(newDiv);
}
}
</script>
</head>
<body>
<div id="divFixed">
</div>
</body>
</html>
<script type="text/javascript">
window.addEventListener('load', () => { createNewDivs(); });
</script>

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