<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<ul id="box">
<li>xx</li>
<li>aa</li>
<li>dd</li>
<li>ss</li>
</ul>
<script>
var box = document.getElementById("box");
var liObj = box.children;
for (var i = 0; i < liObj.length; iPP) {
var li = liObj[i];
(function (i) {
li.onclick = function () {
console.log(i)
};
})(i)
}****
</script>
</body>
</html>what I understand is that the trigger of the for loop is completed in an instant, and the I in the subsequent order is not in accordance with 0-3. The function is immediately executed to pass the external parameters in, referencing the external I variables to form a closure, so when the li event is triggered inside, according to the principle of scope variable search, the I found is passed in.
li execute the self-calling function to bind the li tag to a click function I each time because the current scope is not available, you have to trace back to the I passing parameters to the self-calling function and output
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