使用JavaScript实现C语言经典编程题：语法对比与实战

var man, woman, child;
for (man = 0; man < 17; man ++) 
{
  for (woman = 0; woman <= 25; woman ++) 
  {
    child = 30 - man - woman;
    if ( (man + woman + child == 30) && (man * 3 + woman * 2 + child == 50) )
    {
      document.write("男人："+man+","+"女人："+woman+","+"小孩："+child +"</br>");
    }
   }
} 

var n;
var s = 1;
var e = 1;
for (n = 1; n <= 50; n ++)
{
  s = s * n;
  e = e + (1 / s);
}
document.write(e); 

<html>
<head lang="en">
  <meta charset="UTF-8">
  <title>C语言经典题目3</title>
  <script>
    function demo() {
      var n = document.getElementById("number").value;
      if (!isNaN(n)) {var len = n.length;
      }
      else{
        alert("请输入数字！");
        return;
      }
      document.getElementById("number").value = len;
    }
  </script>
</head>
<body>
  <input type="text" id="number" width="100" height="50">
  <button onclick="demo()">点我啊</button>
</body>
</html>

function demo()
{
  var i, j, s;
  for(i = 1; i < 10; i ++)
  {
    for(j = 1; j <= i; j ++)
    {
      s = i * j;
      document.write(j+"*"+i+"="+s+" ");
    }
    document.write("<br/>");
  }
}  

<body>
<input id="getScore" type="text">
<button onclick="demo()">平均分</button>
<p id="txt"></p>
<script>
  function demo() {
    var str = document.getElementById("getScore").value;
    var score = new Array();
    score= str.split(",");
    var max = 0;
    var min = 10000;
    var sum = 0;
    var ave = 0;
    for(i=0;i<score.length;i++){
      if(score[i]>max)
      {
        max = score[i];
      }
      if(score[i]<min)
      {
        min = score[i];
      }
      sum = sum+score[i];
    }
    ave = (sum-max-min)/8;
    document.getElementById("txt").innerHTML = ave;
  }
</script>
</body>