HTML 表单转换为 Javascript 变量

Question

I'm reasonably new to Javascript so sorry if this has a simple answer.

I would like to make the name that a user inputs in a form into a javascript variable. For example, If the user inputs the name 'James' into the form, I would like the variable 'ans1' to be equal to the string 'James'. Heres my code...

 <form> Name: <input type="text" id="username" /> <input type="submit" value="Submit" onClick="makeans1()" /> </form> <script> function makeans1() { var ans1 = document.getElementById.value('username'); alert(ans1); } </script>

The reason I have added an alert is to check to see if the code has worked. Any help would be very much appreciated. Thanks

Answer 1

Change : var ans1 = document.getElementById.value('username'); .

To : var ans1 = document.getElementById("username").value; .

 function makeans1() { var ans1 = document.getElementById("username").value; alert(ans1); }

 <form> Name: <input type="text" id="username" /> <input type="submit" value="Submit" onClick="makeans1()" /> </form>

Answer 2

The correct code should be:

var ans1 = document.getElementById('username').value;

And always put your alert() 's at the beginning of the function. if you want to test function-hit :)

Answer 3

Just replace below line

var ans1 = document.getElementById.value('username');

with

var ans1 = document.getElementById('username').value