javascript - 如果字符数 =< 160，如何将初始 SMS 数显示为 1？

Question

我有一个 jquery 代码，我想显示当前正在键入的字符数、剩余字符数以及 SMS 等的数量。 0 到 160 之间的值是 1 条 SMS，高于该值且小于 321 的任何值都是拖曳 SMS。高于 160 的值向文档打印 2 条短信，但初始值永远不会更改为 1。它始终为零。我该如何做对？这是 jquery 代码:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<script type="text/javascript">

$(document).ready(function() {

    var text_max = 481;

    $('#textarea_feedback').html(text_max + ' characters remaining');

    $('#textarea1').keyup(function() {
    	
        var text_length = $('#textarea1').val().length;

        var cur = text_length;

        var text_remaining = text_max - text_length;
        

        $('#textarea_feedback').html(text_remaining + ' characters remaining');

        $('#textarea_cur').html(cur + ' current characters');

         var sms = 1;

         $('#smsNum').html(sms + ' SMS');
          
          if(cur <= 160) {

    	    $('#smsNum').html(sms);

          }if(cur >= 161) {

    	    $('#smsNum').html(sms += 1 );

         }else{

         	$('#smsNum').html(sms -= 1 );
         }

    });

});

</script>

The HTML code:

<span id="textarea_cur"></span>

 <div id="smsNum"> SMS </div>

   <textarea id="textarea1" rows="5" cols="40" maxlength="482" >

   </textarea>

 <span id="textarea_feedback">

</span>

Answer 1

if(cur >= 161) {
$('#smsNum').html(短信+= 1);
}

这只会给你 2 条短信，无论你在 160 之后增加多少字符数，因为你没有计算短信数量，只是让你的 sms = cur/160

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<script type="text/javascript">

$(document).ready(function() {

    var text_max = 481;

    $('#textarea_feedback').html(text_max + ' characters remaining');

    $('#textarea1').keyup(function() {
    	
        var text_length = $('#textarea1').val().length;

        var cur = text_length;

        var text_remaining = text_max - text_length;
        

        $('#textarea_feedback').html(text_remaining + ' characters remaining');

        $('#textarea_cur').html(cur + ' current characters');

         var sms = parseInt(cur/160);

         $('#smsNum').html(sms + ' SMS');


    });

});

</script>

The HTML code:

<span id="textarea_cur"></span>

 <div id="smsNum"> SMS </div>

   <textarea id="textarea1" rows="5" cols="40" maxlength="482" >

   </textarea>

 <span id="textarea_feedback">

</span>