STATEMENT:  if...else

if (condition) {statements1} [else {statements2}]
The if...else statement executes one set of statements if a specified condition is true, and another if it is false.
The following example tests the result of a function and displays one of two messages depending on whether the result is less than 10 or not:
if(calcaverage(x,y,z) < 10)
   document.write("The average is less than 10.");
   document.write("The average is 10 or more.");

You shouldn't use simple assignment statements such as if(a = b) in a conditional statement.

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