axure 60秒倒计时

 在a标签的href属性中执行js代码，实现60秒倒计时

javascript:eval("
var counter = 60;
var interval = setInterval(function() {
    counter--;
    if (counter <= 0) {
        clearInterval(interval);
    }
    $('#u3_text>p>span').html(counter + '秒后发送');
}, 1000);
")