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📅 最后修改于: 2022-03-11 15:03:30.887000 🧑 作者: Mango
var json = {key1: 'value1', key2: 'value2'} "key1" in json ? console.log('key exists') : console.log('unknown key') "key3" in json ? console.log('key exists') : console.log('unknown key')