console 命令行工具 X clear

console

function isbn10(code) {
    code = (code + '').replace(/[-\s]/g, '');
    if (!/^\d{9}[\dxX]?$/.test(code)) return false;
    var i = 0, c = 0; // c:checksum
    for (; i < 9;)
        c += code.charAt(i++) * i;
    c %= 11; if (c == 10) c = 'X';
    if (code.length == 9) return code + c;
    return c == (i = code.charAt(9)) || c == 'X' && i == 'x';
}
function isbn13(code){
      code = (code + "").replace(/[-\s]/g, "")
      if (!/^\d{12,13}$/.test(code)) return false
      var i = 1,
        c = 0 // c:checksum
      for (; i < 12; i += 2) c += Math.floor(code.charAt(i))
      for (c *= 3, i = 0; i < 12; i += 2) c += Math.floor(code.charAt(i))
      c = (220 - c) % 10 // 220:大于(1*6+3*6)，%10==0即可。
      if (code.length == 12) return code + c
      return c == code.charAt(12)
}

function submit() {
    var oInput = document.getElementById("app")
    console.log("结果", oInput)
    var r = isbn13(oInput.value)
    console.log("结果", r)
   var r1 = isbn10(oInput.value)
    console.log("结果", r1)

}

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>菜鸟教程(runoob.com)</title> 
</head>
<body>
ISBN: <input type="text" name="FirstName" id="app" ><br>
<input type="submit" value="提交" onclick="submit()">
</body>
</html>