<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<script type="text/javascript">
function next_id(){
var current_id = 0
return function (){
return ++current_id
}
}
var g = next_id()
for( let i = 0i <10i++ ){
console.log(g())
}
</script>
<body>
</body>
</html>
js给li加id的方法是：<script type="text/javascript">
var ul = document.getElementById("ul")
li = document.createElement("li")
txt = document.createTextNode("txt")
li.className = 'className'
li.id='id' //此处添加id
li.onclick = function() {alert('helo')}
li.appendChild(txt)
ul.appendChild(li)
</script>
