回答編集履歴
1
ついき
test
CHANGED
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@@ -29,3 +29,37 @@
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29
29
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<input type="text" class="js-count"><input type="text" class="show-count" readonly tabindex="-1"><br>
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30
30
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31
31
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```
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32
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+
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33
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+
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34
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+
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35
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+
# 追記
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36
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+
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37
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どうしてもidやクラスを変えたくないならこうです
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38
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+
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39
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```javascript
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40
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+
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41
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<script>
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42
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43
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$(function(){
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44
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45
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$('#js-count01,#js-count02,#js-count03,#js-count04').on('keyup',function(){
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46
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47
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var num=$(this).attr('id').substr(-2);
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48
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49
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$('.show-count'+num).val($(this).val().length);
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50
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51
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});
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52
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+
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53
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});
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54
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55
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</script>
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56
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+
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57
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<input type="text" id="js-count01"><input type="text" class="show-count01" readonly tabindex="-1"><br>
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58
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+
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59
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<input type="text" id="js-count02"><input type="text" class="show-count02" readonly tabindex="-1"><br>
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60
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+
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61
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<input type="text" id="js-count03"><input type="text" class="show-count03" readonly tabindex="-1"><br>
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62
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+
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63
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<input type="text" id="js-count04"><input type="text" class="show-count04" readonly tabindex="-1"><br>
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64
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+
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65
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```
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