$(‘#phoneNumber‘).on(‘input‘,function() {
    var valueP = $(this).attr(‘value‘);
    if(valueP.length == 11){
        $(‘#getVerCode‘).removeClass(‘unclick‘);
        $(‘.getVerCodeJ‘).css(‘display‘,‘none‘);
    }
    else{
        $(‘#getVerCode‘).addClass(‘unclick‘);
        $(‘.getVerCodeJ‘).css(‘display‘,‘block‘);
    }
});

//for ie
  if(document.all){
    $(‘#phoneNumber‘).each(function() {
      var that=this;

      if(this.attachEvent) {
        this.attachEvent(‘onpropertychange‘,function(e) {
          if(e.propertyName!=‘value‘) return;
          $(that).trigger(‘input‘);

          var valueP = $(this).attr(‘value‘);
          if(valueP.length == 11){
            $(‘#getVerCode‘).removeClass(‘unclick‘);
            $(‘.getVerCodeJ‘).css(‘display‘,‘none‘);
          }
          else{
            $(‘#getVerCode‘).addClass(‘unclick‘);
            $(‘.getVerCodeJ‘).css(‘display‘,‘block‘);
          }
        });
      }
    })
  }

js input监听兼容事件