📅 最后修改于: 2020-10-24 08:19:50 🧑 作者: Mango
JavaScript Symbol是用于识别对象属性的函数。
Symbol([description])
描述：它是可选的。我们可以将字符串作为参数传递。
让我们看一下JavaScript Symbol属性的列表及其描述。
| Symbol.hasInstance | It is used to determine if a constructor object recognizes an object as its instance. |
| Symbol.isConcatSpreadable | It is used to configure if an object should be flattened to its array elements. |
| Symbol.match | It is a method to identify the matching of a regular expression against a string. |
| Symbol.prototype | It is used for produce the prototype for the symbol constructor. |
| Symbol.replace | It replace matched substring of a string. |
| Symbol.search | It returns the index within a string that matches with the regular expression. |
| Symbol.split | It splits a string at the indices that match the regular expression. |
| Symbol.toPrimitive | It is used to convert an object to its equivalent primitive value. |
| Symbol.unscopables | It is a well-known object property whose property name are excluded from with environment. |
让我们看一下JavaScript Symbol Method的列表及其描述。
| Symbol.for() | It is used to search for existing symbol in a runtime-wide symbol registry with the provided key and returns if it is found. Otherwise new symbol gets created with this key. |
| Symbol.keyFor() | It uses the global symbol registry to look up the key for the symbol. So it doesn’t work for non-global symbols. If the symbol is not global, it won’t be able to find it and returns undefined. |
| Symbol.toString() | It is used to return a string representation of an object. |