IE9分配的值不同于IE Quirks模式

Question

I'm using javascript to dynamically assign values to some html elements

var newInput = document.getElementById('newInput1');
var oldInput = document.getElementById('oldInput1');

newInput.value = oldInput.firstChild.nodeValue;

When I run this in IE Quirks Mode, my value is returned appropriately. My debugger will read:

Name      |  Value
newInput  |  777

however, in IE9 I'll sometimes get:

Name      |  Value
newInput  |  "\n   \n  777\n"

I haven't encountered this problem before; has .firstChild or .nodeValue been replaced in IE9?

Edit

I've noticed while assigning newInput.value, a single space " " is added to the string. This space is .trim med later in the code, but perhaps IE9 can't accept it at some point or another

Answer 1

oldInput.firstChild.nodeValue.trim(); //to remove extra new line

The trim() method removes whitespace from both sides of a string.

Note: The trim() method does not change the original string.

see this reference