`void` is a unary operator, takes any value, returns undefined
`void` is reserved keyword, whereas undefined is a property of global/window
object and can be overriden in local scopes

【 在 hgoldfish (老鱼) 的大作中提到: 】
: 2是这样的，我们一般写：
: function ($scope) {
:     $scope.brand = 'lskjdfls';
: ...................
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