Assign 'this' reference to a variable in javascript

问题

Is it possible to assign 'this' reference to a variable in javascript. What I want is:

var someVariable = this;
alert(someVariable);

But I'm getting alert saying 'undefined'.

回答1:

Yes, it is possible to assign this to a variable. When you get undefined, then you probably use/alert the variable outside the scope where it was defined.

This will work:

var someVariable;
function someFunction () {
    someVariable = this;
}
new someFunction();
alert(someVariable);

来源：https://stackoverflow.com/questions/37627344/assign-this-reference-to-a-variable-in-javascript