代码如下：
<SCRIPT LANGUAGE="JavaScript"> <!-- Begin function numbers() { var nummenu = document.lotto.numbercount; var numbercount = nummenu.options[nummenu.selectedIndex].value*1; var maxnumbers = document.lotto.maxnum.value*1; if (numbercount > maxnumbers) { alert("Be sure to select a max lottery number value!"); } else { var ok = 1; r = new Array (numbercount); for (var i = 1; i <= numbercount; i++) { r[i] = Math.round(Math.random() * (maxnumbers-1))+1; } for (var i = numbercount; i >= 1; i--) { for (var j = numbercount; j >= 1; j--) { if ((i != j) && (r[i] == r[j])) ok = 0; } } if (ok) { var output = ""; for (var k = 1; k <= numbercount; k++) { output += "Number " + k + " = " + r[k] + "\n"; } document.lotto.results.value = output; } else numbers(); } } // End --> </script> <form name="lotto"> <table width=100% border=0> <tr> <td align=center>产生数字个数 <select name="numbercount"> <option value="1">1 <option value="2">2 <option value="3">3 <option value="4">4 <option value="5">5 <option value="6" selected>6 <option value="7">7 <option value="8">8 <option value="9">9 <option value="10">10 </select> <br>产生数字范围<input type=text name=maxnum value="49" size=2 maxlength=2><br> <input type=button value="产生随机数" onClick="numbers()"> <p> <textarea name="results" rows=11 cols=15>