JavaScript ES5 notation

1, use strict mode, add code specification

' Use strict '

This is a good habit to avoid some hidden errors in your code. Strict mode is used by default in ES6

2, JS ES5 Two ways to declare the method

(function  () {    ' use strict ';     // A function expression that assigns a method to a variable, which must be called    after the declaration. // recommended ways    to use the website var function  () {    };     // is a function declaration, it will be promoted to the top of the entire JS, can be called    directly at any time function fun2 () {    }    }) ();

3, JS ES5 object-oriented notation

(function () {    ' Use strict '; varOBJ =function () {        //Way One         This. fun1 =function() {Console.log ("Test1"); }    }    //Mode twoObj.prototype.fun2 =function() {Console.log ("Test2");    }; varobj =NewOBJ ();    Obj.fun1 ();    Obj.fun2 (); })();

4, JS ES6 object-oriented notation

class Obj {    fun1 () {        console.log (' fun1 ');}    } var New Obj (); obj.fun1 ();

JavaScript ES5 notation