How so?

```js
>>> v1 = 0
0
>>> v2 = 0
0
>>> s1 = "<!--[if gt IE " + ( ++v1 ) + "]><i></i><![endif]-->"
"<!--[if gt IE 1]><i></i><![endif]-->"
>>> s2 = "<!--[if gt IE " + ( v2 += 1 ) + "]><i></i><![endif]-->"
"<!--[if gt IE 1]><i></i><![endif]-->"
```