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value = Number ( value )
value = parseInt ( value )
value = parseFloat ( value )

以下の例はこれらのファンクションを示しています。
 
function changeit ( value )
{
    value = Number ( value ) ;
 
    if ( value > 100 )
    {
        value = value - 100 ;
    }
 
    return value.toFixed ( 2 ) ;
}