JavaScript实现发送验证码倒计时功能的递归与定时器方案

验证码发送与倒计时核心代码

//发送验证码
$('.js-sms-code').click(function(){
    $(this).attr("disabled", "disabled").html("<span style='color:#666'><span id='countdown'>60</span>s 后再试</span>");
    countdown();
    var tel = $('#tel').val();
    $.ajax({
      url: "{sh::U('Home/sendSmscode')}",
      type:'POST',
      dataType:"json",
      data: {tel: tel},
      success: function() {
      },
      error: function() {
        $('.js-help-info').html("请求失败");
      }
    });
})

function countdown() { // 递归
  setTimeout(function() {
    var time = $("#countdown").text();
    if (time == 1) {
      $('.js-sms-code').removeAttr("disabled");
      $('.js-sms-code').html("发送验证码");
    } else {
      $("#countdown").text(time - 1);
      countdown();
    }
  }, 1000);
}