如何检查 object 是否有钥匙？

Question

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

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

Why do we get error? Am i checking the right way.

I get an error cannot call hasOwnProperty in an Object - TypeError

Answer 1

object is not defined. Check this revision:

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 */
      }
   }
 }
}

Answer 2

Is your for-loop correct? Try this

for (var key in array)
{
  ...

Answer 3

You have not defined object in your for loop. Your array of objects above is named array .

for (var key in array) {

}