《You Don't Know JS》
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第一部:《You don't know JS: this & Object prototype》
第三章 Object
对象常量
var myObject = {};Object.defineProperty( myObject, "FAVORITE_NUMBER", { value: 42, writable: false, configurable: false} );
禁止对象扩展
var myObject = { a: 2};Object.preventExtensions( myObject );myObject.b = 3;myObject.b; // undefined使用preventExtensions方法,可禁止对象再次扩展。
Object.seal(..)
preventExtensions + configurable:false
Object.freeze(..)
s Object.seal(..) + writable:false
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