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function myfunc(){
var x = Math.floor(Math.random() * 11);
var y = parseInt(document.getElementById("enter a guess").value);
if(y==x){
alert("Right ans");
document.body.style.backgroundColor = "green";
}
else
{
alert("wrong ans");
document.body.style.backgroundColor = "red";
}
}<div class="center">
<h1>Enter a guess from 1 to 10</h1>
<input type="text" id="enter a guess" name="enter a guess" placeholder = "enter a guess">
<br><br>
<button class="button"; onclick="myFunc()">Guess</button>
</div>null
我需要从用户的输入int从1到10，并产生一个从1到10的随机数，如果两者相等，并且用户点击猜测按钮，应该显示消息告诉他是对还是错，如果他是对的，页面背景颜色应该是绿色，否则如果是错的，应该是红色
您有多个问题：
id中不能有空格。也不能在按钮类后添加分号；。
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<div class="center">
<h1>Enter a guess from 1 to 10</h1>
<input type="text" id="enter_a_guess" name="enter a guess" placeholder = "enter a guess"><br><br>
<button class="button" onclick="myFunc()">Guess</button>
</div>
<script>
function myFunc(){
var x = Math.floor(Math.random() * 11);
var y = parseInt(document.getElementById("enter_a_guess").value);
if(y==x){
alert("Right ans");
document.body.style.backgroundColor = "green";
} else {
alert("wrong ans");
document.body.style.backgroundColor = "red";
}
}
</script>