Defining numerous variables in a single step?

Is there a solution I can use that allows me to define more than one var with the same value in a single step at the start of my func开发者_如何学运维ion?

function myFunction () {
    var a,b = 0;
    document.write(a) // undefined
    document.write(b) // 0
}

Is there an improved way to write a,b = 0; ?

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Something like this, however I don't like it.

var var1 = "hello",
    var2 = "world",
    var3 = 666;

Better

var var1 = "hello";
var var2 = "world";
var var3 = 666;

Please take a look at http://javascript.crockford.com/code.html

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You can't do two things at once. You can't declare multiple local variables and assign a single value to all of them at the same time. You can do either of the following

var a = 1, 
    b = 1;

or

var a,b;
a = b = 1;

What you don't want to do is

var a = b = 1;

because you'll end up with b being a global, and that's no good.

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var a = 0, b = 0;

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var a = 0, b = a;

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An alternate way

var a = b = 0;