javascript - 单击时将值从输入 1 复制到输入 2

Question

寻找一个脚本，在单击按钮时将输入值 1 复制到输入 2，并添加 +1 以设置文本框。

b = document.getElementById('tussenstand').value;
var theTotal1 = b;

$(document).on("click", "#button1", function(){
    theTotal1 = Number(theTotal2) 
    $('#eindstand').val(theTotal2);        
});
$('#eindstand').val(theTotal2);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input id="tussenstand"></input>
<input id="eindstand"></input>
<input id="sets"></input>

<button id="button1">click</button>

提前致谢。

Answer 1

我想这样就可以了。

$(document).on("click", "#button1", function(){
    var total = document.getElementById('tussenstand').value;
    $('#eindstand').val(total);    
    var sets = parseInt($('#sets').val()); 
    $('#sets').val( (sets || 0) + 1);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<input id="tussenstand"></input>
<input id="eindstand"></input>
<input id="sets"></input>

<button id="button1" onclick="">click</button>