在JavaScript中删除十进制以自动生成结果

Question

我用JavaScript制作了一个计算器，用于自动计算结果。这是工作，但我无法删除小数。

这是我的代码：

import urllib.request
import sys
import io

try:
    url = sys.argv[1]
except IndexError:
    print("usage: test.py url")
    exit(2)

resp = urllib.request.urlopen(url)
length = resp.getheader('content-length')
if length:
    length = int(length)
    blocksize = max(4096, length//100)
else:
    blocksize = 1000000 # just made something up

print(length, blocksize)

buf = io.BytesIO()
size = 0
while True:
    buf1 = resp.read(blocksize)
    if not buf1:
        break
    buf.write(buf1)
    size += len(buf1)
    if length:
        print('{:.2f}\r done'.format(size/length), end='')
print()

$(document).ready(function() {
  $(".input").keyup(function() {
    var val1 = +$(".value1").val();
    var val2 = +$(".value2").val();
    var val3 = +$(".value3").val();
    var val4 = +$(".value4").val();
    var val5 = (".result");
    var decval5 = (val5);
    $(decval5).val(((((val1 / 8) + val2) / 16) + val3) * val4);
  });
});

Answer 1

您可以使用Math.round()：

＆＃13;

＆＃13;

$(document).ready(function() {
  $(".input").keyup(function() {
    var val1 = +$(".value1").val();
    var val2 = +$(".value2").val();
    var val3 = +$(".value3").val();
    var val4 = +$(".value4").val();
    var val5 = (".result");
    var decval5 = (val5);
    $(decval5).val(Math.round(((((val1 / 8) + val2) / 16) + val3) * val4));
  });
});

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div style="border: 1px solid #D3D3D3;background:#fff;">
  <div style="padding:10px 0px 10px 10px;">
    <div style="font-size:20px;"></div>
    <br>
    <center>
      input1
      <input type="text" class="input value3">input2
      <input type="text" class="input value2"> input3
      <input type="text" class="input value1"> input4
      <input type="text" class="input value4"> &nbsp;=&nbsp; result
      <input type="text" disabled="disabled" class="result">
    </center>
  </div>
  <br>
</div>

＆＃13;

＆＃13;

＆＃13;

Answer 2

试，

$(decval5).val(Math.round(((((val1 / 8) + val2) / 16) + val3) * val4));

Answer 3

您可以向上或向下对齐答案，或者只是将其截断：

$(document).ready(function() {
  $(".input").keyup(function() {
    var val1 = +$(".value1").val();
    var val2 = +$(".value2").val();
    var val3 = +$(".value3").val();
    var val4 = +$(".value4").val();
    var val5 = (".result");
    var decval5 = (val5);
    $(decval5).val(((((val1 / 8) + val2) / 16) + val3) * val4);
    
   // Round Up:
   console.log(Math.ceil(parseFloat($(decval5).val())));
    
   // Round Down:
   console.log(Math.floor(parseFloat($(decval5).val())));    
    
   // Truncate:
   console.log(parseFloat($(decval5).val()).toFixed(0));  
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<div style="border: 1px solid #D3D3D3;background:#fff;">
  <div style="padding:10px 0px 10px 10px;">
    <div style="font-size:20px;"></div>
    <br>
    <center>
      input1
      <input type="text" class="input value3">input2
      <input type="text" class="input value2"> input3
      <input type="text" class="input value1"> input4
      <input type="text" class="input value4"> &nbsp;=&nbsp; result
      <input type="text" disabled="disabled" class="result">
    </center>
  </div>
  <br>
</div>