使用ColdFusion，我怎么显示在随机顺序数组中的元素？ [英] Using coldfusion, how do I display the elements of an array in random order?

问题描述

使用ColdFusion，我的目标是输出数组在一个完全随机的所有元素。我的数组这是从一个XML文件拉到6000项。

通常情况下，如果我没有要求他们在一个随机的顺序输出，我会做这样的：

 ＆LT;＆CFOUTPUT GT;
＆所述; CFLOOP从=1=＃arraylen（thestring）＃索引=×＆GT;
#thestring [X]＃＆LT; BR /＆GT;
＆LT; / CFLOOP＆GT;
＆LT; / CFOUTPUT＆GT;
 

其结果是，我的琴弦显示在他们从XML文件时，拉顺序为：

  thestring [1]
thestring [2]
thestring [3]
thestring [4]
 

等。等所有的方式到thestring [6000]。

我想看到的是所有项目输出完全随机的顺序为：

  thestring [5]
thestring [22]
thestring [4301]
thestring [201]
thestring [2041]
 

解决方案

更新：这更多的是一个快速演示来证明一个较早的建议会工作的。但也有少数的其他建议比较精简。因此，我建议用其中之一吧。

根据您最新的更新，我认为没有理由雷蒙德的建议是行不通的。只要你保持跟踪已显示的元素。下面是一个简单的例子

 ＆LT;＆CFSCRIPT GT;
    //生成样品阵列
    yourArray = [];
    为（X = 1; X＆下; = 20; X ++）{
            arrayAppend（yourArray，项＆放大器; X）;
    }    //用于存储指数
    访问= {};
    为（X = 1; X＆下; = arrayLen（yourArray）; X ++）{            //获得我们以前没有见过的随机指数
            做{
                    指数= randRange（1，arrayLen（yourArray））;
            }
            而（structKeyExists（访问，索引））;            //显示它
            WriteOutput（yourArray [指数]＆安培;＆LT; BR＆gt;中）;            //标志是访问，所以我们不要再次显示它
            参观[指数] =真;
    }
＆LT; / CFSCRIPT＆GT;
 

Using ColdFusion, my goal is to output all the elements of an array in a totally random order. My array has 6,000 items which are pulled from an XML file.

Usually, if I didn't require them to be output in a random order, I would do this:

<cfoutput>
<cfloop from="1" to="#arraylen(thestring)#" index="x">
#thestring[x]#<br/>
</cfloop>
</cfoutput>

The result is that my strings are displayed in the order they were when pulled from the XML file:

thestring[1]
thestring[2]
thestring[3]
thestring[4]

Etc. etc. all the way up to thestring[6000].

What I would like to see is all items output in totally random order:

thestring[5]
thestring[22]
thestring[4301]
thestring[201]
thestring[2041]

解决方案

Update: This was more of a quick demo to demonstrate an earlier suggestion would work . But a few of the other suggestions are more streamlined. So I would recommend using one of them instead.

Based on your latest update, I see no reason Raymond's suggestion would not work. As long as you keep track of the elements already displayed. Here is a simple example

<cfscript>
    // generate sample array
    yourArray = [];
    for (x = 1; x <= 20; x++) {
            arrayAppend(yourArray, "item "& x);
    }

    // stores used indices
    visited = {};
    for (x = 1; x <= arrayLen(yourArray); x++) {

            // get a random index we have not seen before
            do {
                    index = randRange(1, arrayLen(yourArray));
            }
            while (structKeyExists(visited, index));

            // display it
            WriteOutput(yourArray[index] &"<br>");

            // mark are "visited" so we do not display it again
            visited[index] = true;
    }
</cfscript>

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