将对象值分配给新对象的JavaScript

Question

So I am using options to pass values to a new object in a literal object fashion.

var obj = new myObject({height:'500',width:'300');


function myObject(options){

}

I'm not sure the best route to get these values assigned to the object though so that this would work.

 function myObject(options){

...assignment...   

alert(this.width);

    }

Answer 1

function myObject(options){

   // copy the options into the current object
   for (var key in options) {
       if (options.hasOwnProperty(key)) {
           this[key] = options[key];
       }
   }

   alert(this.width);     // 300
}

var obj = new myObject({height:'500',width:'300'});

You can even an extend this concept where you can have default property values myObject , and you can override them with options object:

function myObject(options){
    // DEFAULTS
    this.name = 'Box';
    this.width = '100';
    this.height = '100';

   // copy the options into the current object
   for (var key in options) {
       if (options.hasOwnProperty(key)) {
           this[key] = options[key];
       }
   }

   alert(this.width); 
}

var obj = new myObject({height:'500',width:'300'});     // alert: 300
var obj2 = new myObject({height: '500'});               // alert: 100

Answer 2

var obj = new myObject({height:'500',width:'300'});

function myObject(options){
  alert(options.width);
}