这个其实是对JS随机数的一个练习方式,先把所有人得名字预先写好在一个数组里,然后让数组里的值快速的显示在区域内,当你按停的时候滚动就会停止达到随机效果。
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<!DOCTYPE html> < html > < head > < meta charset = "utf-8" /> < title >JS写的随机点名 - 琼台博客</ title > < script type = "text/javascript" > var isRun=true; var a = ["张三","李四","王五","赵六"]; var a2 = new Array(); function action(str){ var s = document.getElementById("bt").value; if(s=="开始"){ isRun=true; run(); document.getElementById("bt").value="结束"; }else{ isRun=false; document.getElementById("bt").value="开始"; } } function run(){ var i = Math.floor(Math.random() * a.length+ 1)-1; document.getElementById("show").innerHTML=a[i]; if(isRun==false){ var b =true; for(var j in a2){ if(a2[j]==i){ b=false; } } if(b){ a2[a2.length]=i; return; } } setTimeout("run()",10); } </ script > </ head > < body > < div style = "text-align:center; margin-top:100px;width:100%;" > < div id = "show" style = "margin:auto;font-size:50px;width:100px;height:50px; background:#FFEEFF" ></ div > < div style = "margin-top:20px;" > < input id = "bt" type = "button" onclick = "action()" value = "开始" /> </ div > </ div > </ body > </ html > |