<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<input type="password" id="password"><button id="btn">显示密码</button>
<script>
var pwd=document.querySelector("#password")
var btn=document.querySelector("#btn")
console.log(pwd.type)
btn.onclick=function(){
if(pwd.type==="password"){
pwd.type="text"
btn.innerHTML="隐藏密码"
}else{
pwd.type="password"
btn.innerHTML="显示密码"
}
}
</script>
</body>
</html>