javascript - 如何检查对象是否有 key ？

var object = [{key1:'value',key2:'value2'},{'key1:'value',key2:'value2}]

for (var key in object)
     {
      if(!object.hasOwnProperty(key)){continue;}

为什么会出错？我在检查正确的方法吗？

我得到一个error cannot call hasOwnProperty in an Object - TypeError

最佳答案

未定义object。检查此修订：

var myarr = [{key1:'value',key2:'value2'},{key1:'value',key2:'value2'}];
//renamed to myarr to avoid confusion - and removed typos from your code.
//myarr is now an array of objects

//loop through myarr
for (var i=0;i<myarr.length;i=i+1){

 //check if the element myarr[i] is indeed an object
 if (myarr[i].constructor === Object) {

   //loop through the object myarr[i]
   for (var key in myarr[i])  {

      //notice the removal of !
      if(myarr[i].hasOwnProperty(key)){
         /* do things */
      }
   }
 }
}

关于javascript - 如何检查对象是否有 key ？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6747208/