console 命令行工具 X clear

console

function alertId()
{
var txt="Id: " + document.getElementById("myButton").id
txt=txt + ", type: " + document.getElementById("myButton").type
alert(txt)
document.getElementById("myButton").disabled=true
}

<form> 
  <button id="myButton" onclick="alertId()">请点击我！</button> 
 </form>