webs
/
1110.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
		<style type="text/css">
			.snajiao{
				width: 0;
				height: 0;
				border-top:100px solid red;
				border-left: 50px solid transparent;
				border-right: 50px solid transparent;
			}
		</style>
</head>
<body>
  <input type="text" id="username"><br />
  <span id="uName"></span>
	<div class="snajiao"></div>
<script>
  var obj = {
    pwd: '123'
  }
  Object.defineProperty(obj, 'username', {
    set: function (val) {
      document.getElementById('uName').innerText = val
      //document.getElementById('uNmae').value = val
      console.log('set')
    },
    get: function () {
    }
  })
  document.getElementById('username').addEventListener('keyup' ,function () {
    obj.username = event.target.value
  });
	for(let n=1; n<5;n++){
		setTimeout(()=>console.log(n),0)
	};
	//let name;
	console.log(null == undefined);
	console.log(Number("235j"));
	console.log(parseInt("12j"));
</script>
</body>
</html>