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JavaScript写的抽奖程序

 
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JavaScript写的抽奖程序




抽奖程序
<script language="javascript"><br />var timer;<br />var flag = 0;</p><p>//获取随机数<br />function getRandomNum(){<br />var f1 = document.getElementById("f1");<br />var f2 = document.getElementById("f2");<br />var fv1 = f1.value;<br />var fv2 = f2.value;<br />var result = document.getElementById("result");<br />var rand = 0;</p><p>if (!flag && (fv1=="" || fv2=="" || fv1 >= fv2)){<br />flag = 1;<br />alert("必须输入开始数字和结束数字,并且开始数不能大于结束数");<br />return false;<br />}<br />fv2 = fv2*1.5;<br />rand = parseInt(Math.random() *(fv2-fv1+1)+fv1);<br />if (rand>f1.value && rand<f2.value){<br />result.value = rand;<br />}<br />}<br />//开始<br />function setTimer(){<br />timer = setInterval("getRandomNum();",10);<br />document.getElementById("start").disabled = true;<br />document.getElementById("end").disabled = false;<br />}<br />//停止<br />function clearTimer(){<br /> clearInterval(timer);<br /> document.getElementById("start").disabled = false;<br /> document.getElementById("end").disabled = true;<br />}<br /></script>






抽奖程序


范围: -


结果:









运行截图:

抽奖程序




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