console 命令行工具 X clear

console

function fun() {
  if (document.getElementById('001').value == 'ok') {
    document.getElementById('002').value = 1;
  } else {
    document.getElementById('002').value = 2;
  }
}

<input type="text" name="001" id="001" value="文本框1" />
<br>
<br>
<input type="text" name="002" id="002" value="文本框2" />
<br>
<br>
<input type="button" name="003" id="003" value="按钮" onclick="fun()" />