What's the best way to replace links with JS functions?

var link = document.getElementById('confirmToFollow');

link.onclick = function () {
    return confirm("Are you sure?");
};

<a href="#" id="confirmToFollow"...

var link = document.getElementById('confirmToFollow');

link.onclick = function () {
    if( confirm("Are you sure?") ) {
        window.location = "http://www.stackoverflow.com/";
    }
    return false;
};

var allLinks = document.getElementsByTagName('a');
for (var i=0; i < allLinks.length; i++) {
    allLinks[i].onclick = function () {
        return confirm("Are you sure?");
    };
}

<a href="mypage.html" onclick="...

<a href="javascript: confirmLink() ...

<a href="#" onClick="goThere(); return false;">Go to new page</a>`

function goThere()
{
   if( confirm("Are you sure?") )
    {
       window.location.href="newPage.aspx";
    }
}

<a href="http://..." onclick="return confirm('are you sure?')">text</a>

jQuery(document).ready(
    jQuery("a").click(){
        //you'd place here your extra logic
        document.location.href = this.href;
    }
);

$("a").click(function() {if(confirm('yadda yadda')) event.stopPropagation();});

$(".conf").click(function() {if(confirm('yadda yadda')) event.stopPropagation();});

// dangerous - warnings on potentially harmful actions
// usage: add class="dangerous" to <a>, <input> or <button>
// Optionally add custom confirmation message to title attribute

function dangerous_bind() {
    var lists= [
        document.getElementsByTagName('input'),
        document.getElementsByTagName('button'),
        document.getElementsByTagName('a')
    ];
    for (var listi= lists.length; listi-->0;) { var els= lists[listi];
        for (var eli= els.length; eli-->0;) { var el= els[eli];
            if (array_contains(el.className.split(' '), 'dangerous'))
                el.onclick= dangerous_click;
        }
    }
}

function array_contains(a, x) {
    for (var i= a.length; i-->0;)
        if (a[i]==x) return true;
    return false;
}

function dangerous_click() {
    return confirm(this.title || 'Are you sure?');
}

dangerous_bind();

var links = document.getElementsByTagName('A');

for (var i = 0; i < links.length; i++)
{
    links[i].onclick = function ()
    {
       return Confirm("Are you sure?");
    }
}