symbol创建对象属性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>symbol创建对象属性</title>
</head>
<body>
<div id="ad">
</div>
<div></div>
<script>
//向对象添加方法
let game ={}
let methods = {
up:Symbol(),
down:Symbol()
};
game[methods.up] = function () {
console.log('game add methods up ');
};
game[methods.down] = function () {
console.log('game add methods down ');
}
console.log(game);
</script>
</body>
</html>