'expando' Syntax and Note : expando « Javascript Properties « JavaScript Reference

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'expando' Syntax and Note

Note:

Read and write property. 
Can custom properties be added to object. 
    
Syntax:
    
objectName.expando = value
The following example illustrates how to create a custom counter property:
document.expando = true; // instruct the browser to "expand" the properties array
document.counter = 0; // introduce a new property

    

      
      

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