All of the options listed are valid ways to implement a basic infinite loop in JavaScript. while(1) { } uses the fact that 1 is truthy, so the condition is always true. for(;;) { } omits all three components of the for loop (initialization, condition, update), which creates an endless loop. do { } while(true); executes the loop body and then checks the condition, which is always true. These patterns should be used with caution, as infinite loops can cause browsers to become unresponsive, but they can be useful when combined with explicit break conditions to exit the loop when needed.