<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js button_disabled</title>
</head>
<body>
<button id="button" disabled="disabled">0.点我无效！</button>
<button οnclick="this.disabled='true'; console.log(this.disabled);">1.Disable Me</button>
<script>
/*参考：https://www.w3school.com.cn/tags/att_button_disabled.asp
* https://www.runoob.com/tags/att-button-disabled.html*/
function disableMyself() {
// console.log("document.all:", document.all);
// document.all.Btn1.disabled = true;
document.getElementById("Btn1").disabled = true;
}
function enableBtn1() {
// document.all.Btn1.disabled = false;
document.getElementById("Btn1").disabled = false;
}
</script>
<input id="Btn1" type="button" value="2.Btn1" onClick="disableMyself();">
<input type="button" value="enable Btn1" onClick="enableBtn1();">
</body>
</html>
