Is there a way to customize/override assignment operations in JavasScript?

问题

Every time I assign a string, I'd actually like to assign a string object, without the extra code.

This var foo = "bar";
becomes var foo = new String("bar");

Basically hi-jacking the assignment.

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Follow-up:
If the above is not possible is there a way to prototype the string variable type, rather than the String object?

As pointed out by armando, the foo would be a string type, but is essentially a customized array. It would be nice to be able to prototype functions to that class.

回答1:

1. No this is not possible
2. If it was possible, you really would not want to do this, at least not globally.

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• The string variable type does not have all the extra overhead that an object does.
  Note: the string array that is created (in your case, foo) would have other properties (eg foo.length)
• Objects come at a performance hit

回答2:

It's not quite what you're looking for, but you may want to look at Overriding assignment operator in JS

来源：https://stackoverflow.com/questions/3770480/is-there-a-way-to-customize-override-assignment-operations-in-javasscript