在讲解 configurable 之前，先来看一道面试题：a = 1; console.log( window.a ); // 1 console.log( delete window.a ); // true console.log( window.a ); // undefined var b = 2; console.log( window.b...
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delete
在讲解 configurable 之前，先来看一道面试题：a = 1; console.log( window.a ); // 1 console.log( delete window.a ); // true console.log( window.a ); // undefined var b = 2; console.log( window.b...