zhuzhuaicoding

// Prevent Default Behavior

// 'return false' stops the default behavior of the event 
// and prevents it from bubbling up DOM, which kills 
// event delegation and may not be what you indented.
// You might consider using e.preventDefault() or 
// e.stopPropagation() instead 

//event.preventDefault()
//Event Delegation Friendly 

zhuzhuaicoding

// Use === and !==

// It is often better to use the === and !== operators  
// rather than == and != operators. The reason for this
// is that === and !== (also known as the identity operators)
// check for the type as well as the value when being compared
// whereas the == and != will try to coerce the two values
// into the same type before the comparison is made, which
// may lead to some very unexpected results.