使用javascript创建ON/OFF按钮

Question

在页面上放置一个可用作ON/OFF开关的按钮.设计此按钮,使按钮标记为"ON".单击按钮时,其标签应更改为"OFF".再次单击它应该将其更改回"ON",依此类推.

Answer 1

好吗？:

<script type="text/javascript">
function onoff(){
  currentvalue = document.getElementById('onoff').value;
  if(currentvalue == "Off"){
    document.getElementById("onoff").value="On";
  }else{
    document.getElementById("onoff").value="Off";
  }
}
</script>

<input type="button" value="On" id="onoff" onclick="onoff();">