你为什么要在javascript中使用0> 0？

Question

I was going through some of StackOverflow's client side code and I ran across this block of JavaScript in the source-code of https://stackoverflow.com/questions/ask :

if ($answerCheckbox.is(':checked') || 0 > 0) {
     $answerCheckbox.attr('checked', true);
     $('#question-only-section').hide();
     StackExchange.using("editor", function () {
          setTimeout(function () { showAnswerSection(true) }, 2);
     });
}

Why wouldn't you use false instead?

Answer 1

You're assuming the code is all natively written Javascript. It isn't uncommon to see some server-generated script which references elements via some programmatic identifier which resolves like this at runtime, which admittedly looks a little peculiar.

Answer 2

它是生成的代码（不在.js文件中），所以显然这两个值中的一个并不总是0而是服务器端变量。

Answer 3

There is no reason for it... but until you know the server side code, you can't know for sure.

Let's say (PHP) you had a variable $x=1 and could also be $x=0 depending on the scenario.

if ($answerCheckbox.is(':checked') || <?php echo $x;?> > 0) {

That code makes perfect sense....

Answer 4

Because that line probably comes from php, like so:

if ($answerCheckbox.is(':checked') || <?php echo $tot; ?> > 0) {

I know because in some situations I had to write code like that.