JavaScript变量的值会自动转义

Question

<script>
test('test.php?a=%3D');//alert(1)
function test(a){
    alert(a);
    if(a == 'test.php?a=%3D'){
        alert(1);
    }else{
        alert(2);
    }
}
</script>
<a href="javascript:test('test.php?a=%3D')">aaa</a > <!-- alert(2) -->

why two different ways get different results? can anyone help me? thank you very much!

Answer 1

Let's analyze these two scenarios:

1. test('test.php?a=%3D');//alert(1) test.php?a=%3D is considered as a variable.

2. <a href="javascript:test('test.php?a=%3D')">aaa</a > <!-- alert(2) --> test.php?a=%3D is considered as an URL with query string and %3D converts to = . So the complete result is test.php?a==

That's the reason these two values are different. Again, consider the code which is shown below - test.php?a=%3D is considered as a variable, so result is alert(1) .

<input type="button" value="Click" onclick="javascript:test('test.php?
a=%3D')"/>

Answer 2

You have error in your code

Line 12

<a href="javascript" click="test('test.php?a=%3D'">aaa</a > <!-- alert(2) -->

Change this line and try