<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>数组</title>
<script type="text/javascript">
var x = [1,3,5,7,9,11,13,15];
var sum = 0;
for (var i = 0;i <=7; i++){
var j =x[i]
for (var k = 0;k <=7; k++){
var l =x[k]
for (var o = 0;o <=7; o++){
var p = x[o]
var end = x[i]+x[k]+x[o];
switch(end)
{case 31:
sum++
document.write(x[i]+","+x[k]+","+x[o]+"<br>");
}
}
}
}
document.write("总共"+sum+"个");
</script>
</head>
<body>
</body>
</html><!DOCTYPE HTML><html ><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>数组</title><script type="text/javascript">var x = [1,3,5,7,9,11,13,15];var sum = 0;for (var i = 0;i <=7; i++){ var j =x[i] for (var k = 0;k <=7; k++){ var l =x[k] for (var o = 0;o <=7; o++){ var p = x[o] var end = x[i]+x[k]+x[o]; if(end = 31){ sum++ } else { sum=sum } } } } document.write("总共"+sum+"个");</script></head><body></body></html>假如我使用switch函数，出现的结果就是36正确，但是我用if他就会显示512 也就是循环的次数，求大神解答一下为什么会这样，如果我想用if函数写的话该怎么写? 谢谢帮忙。。。
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