Parse email address from URL parameter = email

parse-email.js

<!-- Parse email address from URL parameter = email -->
<script>
var mail = document.querySelector('input#email_address');
if (mail) {
var t = document.location.href.split('?')[1];
if (t) {
    var params = {};
    var lst = t.split('&'), l = lst.length;
    for (var i = 0; i < l; i++) {
        var p = lst[i].split('=');
        if (!p[1]) continue;
        params[p[0]] = p[1];
    }

    if (params.mail) {
        mail.value = params.mail;
    }
    }
    }

</script>
<!-- /parse email -->