Please input a max number:<br>
<input type="text" id="d"><br>
<script>
var range;
document.getElementById("d").value = 45;
range=document.getElementById("d").value;
</script>
<script>
range=document.getElementById("d").value;
</script>
Please enter the number you want to exclude(You can keep it blank):<br>
<input type="text" id="e"><br>
<input type="text" id="f"><br>
<input type="text" id="g"><br>
The first lucky student:<br>
<input type="text" id="a"><br>
The second lucky student:<br>
<input type="text" id="b"><br>
The third lucky student:<br>
<input type="text" id="c"><br>

<button onclick="clickMath()">按下决定幸运儿</button>

<script>
function clickMath(){
var cut1;
var cut2;
var cut3;
cut1=document.getElementById("e").value;
cut2=document.getElementById("f").value;
cut3=document.getElementById("g").value;
var ceil = Math.ceil(Math.random()*document.getElementById("d").value);
while(ceil==cut1 || ceil==cut2 || ceil==cut3){ceil = Math.ceil(Math.random()*document.getElementById("d").value);}
document.getElementById("a").value = ceil;
var ceil1 = Math.ceil(Math.random()*document.getElementById("d").value);
while(ceil1==ceil || ceil1==cut1 || ceil1==cut2 || ceil1==cut3){ceil1 = Math.ceil(Math.random()*document.getElementById("d").value);}
document.getElementById("b").value = ceil1;
var ceil2 = Math.ceil(Math.random()*document.getElementById("d").value);
while(ceil2==ceil || ceil2==ceil1 || ceil2==cut1 || ceil2==cut2 || ceil2==cut3){ceil2 = Math.ceil(Math.random()*document.getElementById("d").value);}
document.getElementById("c").value = ceil2;
}
</script>