How to handle empty object in if statement as false?
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我今天偶然发现这个案子
1 2 3 | if ({}) { // This is returned as empty object is true } |
因此,需要找出一种方法,其中
您可以使用object.keys()方法来实现这一点。
从Mozilla的文档中:
The
Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop (the difference being that afor-in loop enumerates properties in the prototype chain as well).
1 2 3 4 5 6 7 | if (Object.keys({}).length) { console.log('Object is not Empty'); } else { console.log('Object is Empty'); } console.log(Object.keys({}).length); |
您可以尝试使用:
1 | Object.keys(obj).length === 0; |