Go: JavaScript gets object properties and methods

first, Get Object properties and Methods Object.keys () for in returns an array of the names of the enumerable properties and methods of the object . all properties of the returned array ( enumerable or non-enumerable ) are directly found for the given Object. Object.getOwnPropertyNames() 

1//To create a method for constructing an object2functionMYOBJ (name, Attr) {3THIS.name =Name4This.attr =attr56This.sayhi =function() {7Return ' Hi everyone!!! ';8}9}1011//Create an Object12var mytester =New MYOBJ ("shinejaie", 1)13//Gets properties and methods that are defined (enumerable) directly on the object14var arr =Object.keys (mytester);Console.log (' arr ', arr);//Output arr ["name", "attr", "sayhi"]1617//All properties of the returned array (enumerable or Non-enumerable) are directly found for the given Object.Console.log ("attr", object.getownpropertynames (mytester));//Output attr ["name", "attr", "sayhi"]1920//Add a property to the Object prototypeObject.prototype.newShine = "it s me";2223//Returns an enumerable property that has been found in the prototype chain of the object24for (var iInchMytester) {25Console.log (i);26}27// output name,attr,sayhi,newshine28 29 // Returns the enumerable property directly defined on the Object. Span style= "color: #008080" >30 for (var i in mytester) {31 if (mytester.hasownproperty (i)) { 32  console.log (i);  }34 }35 // output name,attr,sayhi     

second, object.keys (), Object.getOwnPropertyNames()、for...in...对比

1//Non-enumerable Object Properties2var nonenum =Object.create ({}, {3getfoo: {4 value:function() {5ReturnThis. foo;6},7 enumerable:False8}9});Ten Nonenum.foo = 1;NONENUM.ASJ = 2;1213//Gets an enumerable or non-enumerable property of an objectConsole.log (object.getownpropertynames (nonenum). Sort ());//Output ["asj", "foo", "getfoo"]1516// Gets the object enumerable property 17 console.log (object.keys (nonenum). sort ()) ; // output ["asj", "foo"]18 Span style= "color: #008080" >19 // Returns an enumerable property that is directly defined on the object 20 for (var i in nonenum) {21 if  (nonenum.hasownproperty (i)) {22 console.log (i); // output foo Asj23 }24}          

third, Get The JavaScript object property name and method name, respectively

1//To create a method for constructing an object2functionMYOBJ (name, Attr) {3THIS.name =Name4This.attr =attr56This.sayhi =function() {7Return ' Hi everyone!!! ';8}9}1011//Create an Object12var mytester =New MYOBJ ("shinejaie", 1)1314//Get Object methods15for (var iInchMytester) {16If (mytester.hasownproperty (i) &&typeof mytester[i] = = "function") {Console.log ("object method:", i, "=", mytester[i])18}19}20//Output object Method: sayhi = () {return ' Hi everyone!!! ';}21 22 // Get Object Properties 23 for (in mytester) {24 if (mytester.hasownproperty (i) && typeof mytester[i]! = " function "" {25 console.log ("object properties:" , i); 26 }27 }28 // Output Object properties: Name Object properties: attr              

Go: JavaScript gets object properties and methods