如何运行此脚本一次？

时间：2018-02-16 00:24:57

标签： javascript html

我不是程序员，所以也许我在某个地方寻找的信息，但我不知道如何搜索它。

我有这个脚本按类别发布最近的帖子。它将永远得到该类别的最新发布帖子而不会结束。如果有任何解决方案让它运行一次。

示例：如果我将此代码放入博客文章中，我希望它仅发布来自特定类别的最新5个帖子，并在此之后停止从该类别发布任何新发布的帖子。

我不知道你是否理解我的意思，但请原谅我，因为我不是程序员。

谢谢.. 

    <style>
/*Recent Post By tag*/
img.recent-thumb{float:left;margin-right:10px;height:50px;width:50px;}
.recent-by-tag{width:100%;margin:0;padding:0}
ul.recent-by-tag li{padding:10px 0;margin-bottom:0;margin-right:28px;border-bottom:1px solid #ddd}
.recent-by-tag li{font-size:13px;list-style:none;padding-left:0;margin:0;padding:0;overflow:hidden}
.recent-by-tag a{font-family:'Oswald',sans-serif;font-size:14px;font-weight:normal;margin:0;}
.recent-by-tag strong{padding-left:0}
span.showdates{font-size:14px;margin:10px 0 0}</style>
<div id="rcentDiv">
</div>
<script type='text/javascript'>
var numposts = 10;
var showpostthumbnails = true;
var showpostdate = false;
// Recent Post By Tag
// Recent Post By Tag For Blogger
// insert revised rcentbytag() code here
function rcentbytag(e) {
    var storedHTML = "";
    function saveHTML(h) {
        storedHTML += h;
    }
    saveHTML('<table><tbody><tr><td><ul class="recent-by-tag">');
    for (var t = 0; t < numposts; t++) {
        var n = e.feed.entry[t];
        var r = n.title.$t;
        var i;
        if (t == e.feed.entry.length) break;
        for (var o = 0; o < n.link.length; o++) {
            if (n.link[o].rel == "replies" && n.link[o].type == "text/html") {
                var u = n.link[o].title;
                var f = n.link[o].href
            }
            if (n.link[o].rel == "alternate") {
                i = n.link[o].href;
                break
            }
        }
        var l;
        try {
            l = n.media$thumbnail.url
        } catch (h) {
            s = n.content.$t;
            a = s.indexOf("<img");
            b = s.indexOf('src="', a);
            c = s.indexOf('"', b + 5);
            d = s.substr(b + 5, c - b - 5);
            if (a != -1 && b != -1 && c != -1 && d != "") {
                l = d
            } else l = "http://2.bp.blogspot.com/-giova1ZCh-A/Uzq6L8QTJNI/AAAAAAAAAJc/USXictTq_xs/s70-c/KM+Icon.png"
        }
        var p = n.published.$t;
        var v = p.substring(0, 4);
        var m = p.substring(5, 7);
        var g = p.substring(8, 10);
        var y = new Array;
        y[1] = "January";
        y[2] = "February";
        y[3] = "March";
        y[4] = "April";
        y[5] = "May";
        y[6] = "June";
        y[7] = "July";
        y[8] = "August";
        y[9] = "September";
        y[10] = "October";
        y[11] = "November";
        y[12] = "December";
        saveHTML('<li class="clear">');
        if (showpostthumbnails == true) saveHTML('<a href="' + i + '" target ="_blank" title="' + r + '"><img class="recent-thumb" alt="' + r + '" src="' + l + '"/></a>');
        saveHTML('<strong><a href="' + i + '" target ="_blank" title="' + r + '">' + r + '</a></strong>');
        saveHTML('<br>');
        var x = "";
        var T = 0;
        if (showpostdate == true) {
            x = '<span class="showdates">' + x + g + " " + y[parseInt(m, 10)] + " " + v + "</span>";
            T = 1
        }
        saveHTML(x);
        saveHTML("</li>");
        if (t != numposts - 1) saveHTML("")
    }
    saveHTML("</ul></td></tr></tbody></table>")
    document.getElementById("rcentDiv").innerHTML = storedHTML;
}
</script>
<script async="async" src="https://www.example.com/feeds/posts/default/-/CategoryName?orderby=published&alt=json-in-script&callback=rcentbytag" return false;"></script>

2 个答案:

答案 0 :(得分：0)

使用布尔值（是/否值）检查函数是否已经运行。

var CodeRan;

function YourFunction(){
  if(!CodeRan){ // If CodeRan is false...
    // Set CodeRan to true, so the next time the function is called it wont get past the If statement.      
    CodeRan = true;

    // Your code goes here.
  } // End of IF statement.
} // End of yourFunction

可能重复： Javascript running code once

答案 1 :(得分：0)

用这个替换你的所有代码，让我知道它是否有效;更改页面后，请确保您刷新页面（谷歌浏览器中的ctrl + F5）以获取新内容。请注意，您提供的代码中存在许多不良做法，我在这里只进行了轻微编辑;如果这是一个生产网站，我强烈建议雇用熟悉现代JavaScript技术的开发人员，如ES6模块。

<style>
/*Recent Post By tag*/
img.recent-thumb{float:left;margin-right:10px;height:50px;width:50px;}
.recent-by-tag{width:100%;margin:0;padding:0}
ul.recent-by-tag li{padding:10px 0;margin-bottom:0;margin-right:28px;border-bottom:1px solid #ddd}
.recent-by-tag li{font-size:13px;list-style:none;padding-left:0;margin:0;padding:0;overflow:hidden}
.recent-by-tag a{font-family:'Oswald',sans-serif;font-size:14px;font-weight:normal;margin:0;}
.recent-by-tag strong{padding-left:0}
span.showdates{font-size:14px;margin:10px 0 0}</style>
<div id="rcentDiv">
</div>
<script type='text/javascript'>
var limitreached = false;
var maxposts = 5;
var numposted = 0;
var showpostthumbnails = true;
var showpostdate = false;
// Recent Post By Tag
// Recent Post By Tag For Blogger
// insert revised rcentbytag() code here
function rcentbytag(e) {
    if (limitreached === false) {
        var storedHTML = "";

        function saveHTML(h) {
            storedHTML += h;
        }

        saveHTML('<table><tbody><tr><td><ul class="recent-by-tag">');
        for (var t = 0; t < maxposts; t++) {
            numposted = numposted + 1;
            if (numposted > maxposts) {
                limitreached = true;
            }

            if (limitreached === false) {
                var n = e.feed.entry[t];
                var r = n.title.$t;
                var i;
                if (t == e.feed.entry.length) break;
                for (var o = 0; o < n.link.length; o++) {
                    if (n.link[o].rel == "replies" && n.link[o].type == "text/html") {
                        var u = n.link[o].title;
                        var f = n.link[o].href
                    }
                    if (n.link[o].rel == "alternate") {
                        i = n.link[o].href;
                        break
                    }
                }
                var l;
                try {
                    l = n.media$thumbnail.url
                } catch (h) {
                    s = n.content.$t;
                    a = s.indexOf("<img");
                    b = s.indexOf('src="', a);
                    c = s.indexOf('"', b + 5);
                    d = s.substr(b + 5, c - b - 5);
                    if (a != -1 && b != -1 && c != -1 && d != "") {
                        l = d
                    } else l = "http://2.bp.blogspot.com/-giova1ZCh-A/Uzq6L8QTJNI/AAAAAAAAAJc/USXictTq_xs/s70-c/KM+Icon.png"
                }
                var p = n.published.$t;
                var v = p.substring(0, 4);
                var m = p.substring(5, 7);
                var g = p.substring(8, 10);
                var y = new Array;
                y[1] = "January";
                y[2] = "February";
                y[3] = "March";
                y[4] = "April";
                y[5] = "May";
                y[6] = "June";
                y[7] = "July";
                y[8] = "August";
                y[9] = "September";
                y[10] = "October";
                y[11] = "November";
                y[12] = "December";
                saveHTML('<li class="clear">');
                if (showpostthumbnails == true) {
                    saveHTML('<a href="' + i + '" target ="_blank" title="' + r + '"><img class="recent-thumb" alt="' + r + '" src="' + l + '"/></a>');
                }
                saveHTML('<strong><a href="' + i + '" target ="_blank" title="' + r + '">' + r + '</a></strong>');
                saveHTML('<br>');
                var x = "";
                var T = 0;
                if (showpostdate == true) {
                    x = '<span class="showdates">' + x + g + " " + y[parseInt(m, 10)] + " " + v + "</span>";
                    T = 1
                }
                saveHTML(x);
                saveHTML("</li>");
                if (t != maxposts - 1) {
                    saveHTML("");
                }
            }
        }
        saveHTML("</ul></td></tr></tbody></table>");
        document.getElementById("rcentDiv").innerHTML = storedHTML;
    }
}
</script>
<script async="async" src="https://www.example.com/feeds/posts/default/-/CategoryName?orderby=published&alt=json-in-script&callback=rcentbytag" return false;"></script>
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