我刚刚创建了随机数。我的问题是如何在id中随机获取值，以及如何每5秒自动设置价格变化以及与当前价格相比波动幅度小于+/- 5％，我不知道使用setinterval函数每个人都可以帮助我
我的代码随机价格:
function generateRandomNumber(min,max) {
return (Math.random() * (max - min) + min).toFixed(2);
};
document.getElementById('price1').innerHTML = generateRandomNumber(0,99.99);
document.getElementById('price2').innerHTML = generateRandomNumber(0,99.99);
document.getElementById('price3').innerHTML = generateRandomNumber(0,99.99);
document.getElementById('price4').innerHTML = generateRandomNumber(0,99.99);
document.getElementById('price5').innerHTML = generateRandomNumber(0,99.99);
document.getElementById('price6').innerHTML = generateRandomNumber(0,99.99);
document.getElementById('price7').innerHTML = generateRandomNumber(0,99.99);
最佳答案
在想出一个更好的解决方案之前，我花了一些时间来解决我遇到的递归问题。
//<![CDATA[
// external.js
function RandNumMaker(min, max, withinPercent, secondsInterval, decimalPlaces){
this.withinPercent = withinPercent || 5;
this.secondsInterval = secondsInterval || 5;
this.decimalPlaces;
if(decimalPlaces){
this.decimalPlaces = decimalPlaces;
}
var t = this, ia = [];
function rb(mn, mx){
return mx-Math.random()*(mx-mn);
}
var pn = rb(min, max);
function rn(){
var p = 1;
if(Math.floor(Math.random()*2) === 1)p = -1
return p*(Math.floor(Math.random()*t.withinPercent)+1)/100*pn;
}
function rf(){
var r, d = t.decimalPlaces;
pn += rn();
if(pn < min || pn > max){
return rf();
}
r = pn;
if(d)r = (Math.floor(Math.round(Math.pow(10, d+1)*r)/10)/Math.pow(10, d)).toFixed(d);
return r;
}
this.setDiv = function(div){
div.innerHTML = rf(); ia = [];
var iv = setInterval(function(){
div.innerHTML = rf();
}, this.secondsInterval*1000);
ia.push(iv);
return this;
}
this.stop = function(){
for(var i=0,l=ia.length; i<l; i++){
if(ia[i]){
clearInterval(ia[i]);
}
}
ia = [];
return this;
}
}
var doc, bod, C, E, N, old = onload; // for use on other loads
onload = function(){
if(old)old();
doc = document; bod = doc.body;
C = function(tag){
return doc.createElement(tag);
}
E = function(id){
return doc.getElementById(id);
}
N = function(className, inElement){
var ii = inElement || doc;
var cN = ii.getElementsByClassName(className);
if(cN){
return cN;
}
var tn = ii.getElementsByTagName('*');
for(var i=0,e,a=[],l=tn.length; i<l; i++){
e = tn[i];
if(e.className && e.className === className)a.push(e);
}
return a;
}
var sr = new RandNumMaker(0, 99.99), sl = N('slow');
var fr = new RandNumMaker(0, 99.99), fs = N('fast');
sr.decimalPlaces = 2;
fr.secondsInterval = 0.1; fr.withinPercent = 5;
for(var i=0,l=sl.length; i<l; i++){
sr.setDiv(sl[i]);
}
for(var i=0,l=fs.length; i<l; i++){
fr.setDiv(fs[i]);
}
}
//]]>/* extrnal.js */
html,body{
padding:0; margin:0;
}
body{
background:#000; overflow-y:scroll;
}
.main{
width:940px; background:#fff; padding:20px; margin:0 auto;
}<!DOCTYPE html>
<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>
<head>
<meta http-equiv='content-type' content='text/html;charset=utf-8' />
<meta name='viewport' content='width=device-width' />
<title>test</title>
<link type='text/css' rel='stylesheet' href='external.css' />
<script type='text/javascript' src='external.js'></script>
</head>
<body>
<div class='main'>
<div class='slow'></div>
<div class='slow'></div>
<div class='slow'></div>
<div class='slow'></div>
<div class='slow'></div>
<div class='slow'></div>
<div class='slow'></div>
<hr />
<div class='fast'></div>
<div class='fast'></div>
<div class='fast'></div>
<div class='fast'></div>
</div>
</body>
</html>现在应该工作!
创建
new RandNumMaker(min, max)之后，您可以使用简单分配来设置randomNumMarkerInstance.decimalPlaces，randomNumMakerInstance.withinPercent和randomNumMakerInstance.secondsInterval。 randomNumMakerInstance.setDiv(div)启动它。 randomNumMakerInstance.stop()停止它。