ruichuang · April 10, 2017 03:08
diff --git a/JS b/JS
 unary plus +
 The unary plus operator precedes its operand and evaluates to its operand but attempts to convert it into a number

 +3     // 3
 +'3'   // 3
 +true  // 1
 +false // 0
 +null  // 0
 +function(val){  return val } // NaN




 this
 3 way to call a func in ES5

 func(p1, p2)
 obj
	unary plus +
	The unary plus operator precedes its operand and evaluates to its operand but attempts to convert it into a number

	+3 // 3
	+'3' // 3
	+true // 1
	+false // 0
	+null // 0
	+function(val){ return val } // NaN




	this
	3 way to call a func in ES5

	func(p1, p2)
	obj
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