错误：检查对象的属性是否存在时，undefined不是对象
[英]Error: undefined is not an object when checking to see if property of object exists
问题描述
Whenever I evaluate my object to see if a property exists, I keep getting the following error message: Error: undefined is not an object (evaluating 'a.result.hasOwnProperty') . 
每当我评估对象以查看属性是否存在时，我都会不断收到以下错误消息： Error: undefined is not an object (evaluating 'a.result.hasOwnProperty') 。
How can I fix it? 我该如何解决？
if(++responseCount === products.length) {
products.sort(function(a, b) {
if((a.result.hasOwnProperty('rawMisMatchPercentage')) && (b.result.hasOwnProperty('rawMisMatchPercentage'))) {
return a.result.rawMisMatchPercentage - b.result.rawMisMatchPercentage;
}
});
return products.slice(0, 3);
}
1 个解决方案
解决方案1
1 已采纳 2017-04-17 09:27:58
Your condition should be 你的情况应该是
(a && a.result && a.result.hasOwnProperty('rawMisMatchPercentage') && (b &&
b.result && b.result.hasOwnProperty('rawMisMatchPercentage'))
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