<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>js 全局、局部变量计数</title>
</head>
<body>
<p>全局、局部变量计数。</p>
<button οnclick="count()">计数!</button>
<p id="demo">0</p>
<script>
let counter = 0;
function add_global() {
counter += 1;
return counter;
}
let add_local = (function () {
let counter = 0;
return function () {
return counter += 1;
}
})();
function count() {
document.getElementById("demo").innerHTML = add_global();
// document.getElementById("demo").innerHTML = add_local();
}
</script>
</body>
</html>
