Generating a random link through Javascript/HTML

烈酒焚心 提交于 2019-12-30 07:49:41

问题


I am trying to create a script that allows me to display a hyperlink that redirects the user to a random url selected out of four sites. So far I have created an array for the sites, and a function that attempts to generate the random url. For my purpose it is important for the output ("Click to go to a random site") is not a button, but a simple (clickable) string.

When running the code I get a reference error "link is not defined (on line 18)". I thought that I had defined link in the code with var link = 'http://' + links[randIdx];, so I am not entirely sure why I am getting this error and how to fix it.

Anyone that could take a look at my code to see where I have made a mistake and how I could fix it?

<a href="javascript:openSite()">Click to go to a random site</a>
<script>
function openSite() {
var links = [
              "google.com",
              "youtube.com",
              "reddit.com",
              "apple.com"]

            openSite = function() {
              // get a random number between 0 and the number of links
              var randIdx = Math.random() * links.length;
              // round it, so it can be used as array index
              randIdx = parseInt(randIdx, 10);
              // construct the link to be opened
              var link = 'http://' + links[randIdx];
              };
              
    return link;
    
    document.getElementById("link").innerHTML = openSite();
}
</script>

回答1:


<a href="javascript:openSite()">Click to go to a random site</a>
<script>
var links = [
              "google.com",
              "youtube.com",
              "reddit.com",
              "apple.com"]

           var openSite = function() {
              // get a random number between 0 and the number of links
              var randIdx = Math.random() * links.length;
              // round it, so it can be used as array index
              randIdx = parseInt(randIdx, 10);
              // construct the link to be opened
              var link = 'http://' + links[randIdx];

     return link;
    };
</script>



回答2:


Here's a simple way to do it.

<script>
    var sites = [
        'http://www.google.com',
        'http://www.stackoverflow.com',
        'http://www.example.com',
        'http://www.youtube.com'
    ];

    function randomSite() {
        var i = parseInt(Math.random() * sites.length);
        location.href = sites[i];
    }
</script>
<a href="#" onclick="randomSite();">Random</a>



回答3:


Here is the code:

var links = [
          "google.com",
          "youtube.com",
          "reddit.com",
          "apple.com"]

function openSite() {
    // get a random number between 0 and the number of links
    var randIdx = Math.random() * links.length;
    // round it, so it can be used as array index
    randIdx = parseInt(randIdx, 10);
    // construct the link to be opened
    var link = 'http://' + links[randIdx];
        return link;
};

document.getElementById("link").innerHTML = openSite();

Here is the fiddle: https://jsfiddle.net/gerardofurtado/90vycqyy/1/



来源:https://stackoverflow.com/questions/37751759/generating-a-random-link-through-javascript-html

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