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<form method="post" id="form1" >
A1 <input type="text" name="a1" value="" /><br>
Y1 <input type="text" name="y1" oninput="fg(this)" value="" /><br>
Y2 <input type="text" name="y2" oninput="fg(this)" value="" /><br>
Y3 <input type="text" name="y3" oninput="fg(this)" value="" /><br>
</form>
<script type="text/javascript">
function fg(t) {
var f = document.getElementById("form1");
var a1 = f.a1.value*1||0;
var y1 = f.y1.value*1||0;
var y2 = f.y2.value*1||0;
var y3 = f.y3.value*1||0;
var tv = t.value*1||0;
if (y1+y2+y3>a1*500) {
alert("输入的数大于最大值");
t.value=a1*500-y1-y2-y3+tv;
}
}
</script>
<form method="post" id="form1" >
A1 <input type="text" name="a1" value="" /><br>
Y1 <input type="text" name="y1" oninput="fg(this)" value="" /><br>
Y2 <input type="text" name="y2" oninput="fg(this)" value="" /><br>
Y3 <input type="text" name="y3" oninput="fg(this)" value="" /><br>
</form>
<script type="text/javascript">
function fg(t) {
var f = document.getElementById("form1");
var a1 = f.a1.value*1||0;
var y1 = t==f.y1?0:f.y1.value*1||0;
var y2 = t==f.y2?0:f.y2.value*1||0;
var y3 = t==f.y3?0:f.y3.value*1||0;
if (t.value>a1*500-y1-y2-y3) {
alert("输入的数大于最大值");
t.value=a1*500-y1-y2-y3;
}
}