Hello.
Take some function:
function DT.operators.Select(body, selectFrame, parentDiv) { this.body = body; this.selectFrame = selectFrame; this.parentDiv = parentDiv; } It can be called in two ways:
DT.operators.Select(op1, op2, op3); // и var x = new DT.operators.Select(op1, op2, op3); And the question arises: what's the difference, except that in the second case, the pointer to the function is passed to the variable?
UPD1 :
How can I hide fields and functions?
In the second case, a variable is created - an object of the class, with which you can continue to work.
In the first case, all actions end on the first line.
function DT.operators.Select(body, selectFrame, parentDiv) { this.body = body; var somePrivateVar = 'value';//приватное свойство. Аналогично объявляются приватные методы this.selectFrame = selectFrame; this.parentDiv = parentDiv; this.myfunc = function(){ alert('hello world'); return this;//Обратите внимание } this.myfunc2 = function(){ alert('good-bye world'); return this;//Обратите внимание } return this;//Обратите внимание } DT.operators.Select(op1, op2, op3).myfunc().myfunc2();//Все. В дальнейшем, доступ к этому объекту отсутствует. var x = new DT.operators.Select(op1, op2, op3); x.myfunc(); //some code x.myfunc2(); //Мы и дальше можем издеваться над этим иксом 
Source: https://ru.stackoverflow.com/questions/35512/
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