Question

code is:

with(location)
    {
        var url=href+"aaa";    
    }
alert(url);

the variable url declare in with,but it can access outside with,why?

Answer 1

In JavaScript, there is no block-level scoping; only function-level scoping. Take these two examples:

if (true) {
    var a = 5;
}

alert(a); // 5

// ...

function foo() {
    var a = 5;
}

foo();

alert(a); // ReferenceError: a is not defined