Microsoft® JScript® << Operator 
Language Reference Version 1

Shifts the bits of an expression to the left.
result = expression1 << expression2The << operator syntax has these parts:
Part Description result Any variable. expression1 Any expression. expression2 Any expression.
The << operator shifts the bits of expression1 left by the number of bits specified in expression2. For example:The variable temp has a value of 56 because 14 (00001110 in binary) shifted left two bits equals 56 (00111000 in binary).var temp temp = 14 << 2For information on when a runtime error is generated by the << operator, see the Operator Behavior table.