var obj = { b: "" }
if(Obj[a]) {}
if(a in Obj) {}
Object.keys(obj).includes('a')
Reflect.has(obj, 'a')
obj.hasOwnProperty('a')
Js判断对象有无属性
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2022-07-12
var obj = { b: "" }
if(Obj[a]) {}
if(a in Obj) {}
Object.keys(obj).includes('a')
Reflect.has(obj, 'a')
obj.hasOwnProperty('a')
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