jQuery创建一个简单的对象，添加属性并访问它

Question

// jquery 2.1.3 imported

var testarray = [];

var newTAelement = TAelement( "rs5", "Thirteen", "13", "15", "14","11","99");

function TAelement(category, question, trueanswer, c1, c2, c3, c4 )
{
    this.category = category;
    this.question = question;
    this.trueanswer = trueanswer;
    this.c1 = c1;
    this.c2 = c2;
    this.c3 = c3;
    this.c4 = c4;
}

testarray.push(newTAelement);

elementextracted = testarray[0];

alert(elementextracted.category);

I want to create the object that has the above properties

I want to store the value named "rs5" in the "category" property

And then add it to the array named testarray

And then access it.

I want to see the alert that says "rs5" but I am not seeing it.

What did I do wrong? Thanks a lot Stack Overflow!

Answer 1

You called the constructor function as if it were a regular function. This meant that the default value of this was (in a browser, outside of strict mode) window and not a new object. It also means that the default return value was undefined instead of that new object.

To use it as a constructor you need to use the new operator .

var newTAelement = new TAelement( "rs5", "Thirteen", "13", "15", "14","11","99");

NB: This has nothing at all to do with jQuery, which you don't use anywhere in your code. It is core JavaScript.