Microsoft® JScript
Expressions
See Also 		Language Reference 

An expression in JScript is any legal combination of values, variables, operators, and expressions. Sample expressions look like: 

78
true || false
"This is a test"
1 + 7.8
y = 97
Legal expressions evaluate to a single value. This value may be a number, string, or logical value. Any legal expression can be used as part of another, larger expression. So the last example above (y = 97) could be used in a different expression: 

z = y = 97
This is a perfectly legal expression. The end result is that 97 is assigned into both y and z..

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