举个简单的例子来演示
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script>
// 如果是对象，一个值修改所有值都会变
var obj = {
name:"张三",
age:18
}
obj.name = "赵六"
console.log(obj.name);
console.log(obj.name);
console.log(obj.name);
// 如果是函数，一个值修改不会影响其他元素的值
function box(){
return{
name:"李四",
age:19
}
}
var a = box()
var b = box()
var c = box()
a.name = "王五"
console.log(a);
console.log(b);
console.log(c);
</script>
</body>
</html>