HTML:

     
    
      
        
       
            
                    
        
         0/200
        
        
       
   
      
     

JS:

//限制输入字数            function LimitedWordsNum() {                $('#doctorIntroduction').keydown(function() {                    var curLength = $('#doctorIntroduction').val().length;                    if(curLength >= 200) {                        var num = $('#doctorIntroduction').val().substr(0, 200);                        $('#doctorIntroduction').val(num);                        weui.alert('超字数限制，多出的字符将被截断！');                    } else {                        $('.textareaLength').text(curLength);                    }                })            }