为什么在分配变量时控制台打印未定义？

Question

Hey pretty simple task I am trying to do.... I'm trying to take the text in my textbox and assign it to a var. When I run without the var I am getting text but if I assign it to a var I get undefined. Could someone explain this to me as it is very confusing to me?

Answer 1

TL;DR : It does not.

You can see content of your variable test , il will output the same thing as before. In fact it is the variable assignement that returns the undefined you see here.

For instance:

var test = 'Hello' // => undefined
test // => 'Hello'

Another case is printing your variable with console.log . If you do so, the return value will be undefined but the output will be your variable content ( Hello here).

console.log(test) // return: undefined / print: Hello

Answer 2

What's returning undefined is the statement itself that you entered into the console, NOT the value of var text .

To see that console.log(text) or simply type text in the console.