在这篇快速的jQuery插件开发教程中,我们将创建一个jQuery插件用来随机排序显示任何一个DOM元素的文字内容 -这将会是一个非常有趣的效果,可以用在标题,logo及其幻灯效果中。
代码片段
那么第一部呢,我们将开发jQuery插件的基本架构。我们将把代码放入一个自运行的方法中,并且扩展$.fn.
assets/js/jquery.shuffleLetters.js
(function($){ $.fn.shuffleLetters = function(prop){ // Handling default arguments var options = $.extend({ // Default arguments },prop) return this.each(function(){ // The main plugin code goes here }); }; // A helper function function randomChar(type){ // Generate and return a random character } })(jQuery);
下一步我们将关注与randomChar()方法。它将会接受一个类型参数(Lowerletter, upperletter或者symbol),并且返回一个随机字符。
function randomChar(type){ var pool = ""; if (type == "lowerLetter"){ pool = "abcdefghijklmnopqrstuvwxyz0123456789"; } else if (type == "upperLetter"){ pool = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; } else if (type == "symbol"){ pool = ",.?/\\(^)![]{}*&^%$#'\""; } var arr = pool.split(''); return arr[Math.floor(Math.random()*arr.length)]; }
我们本应该使用一个简单的字符池来保存所有的字符,但是这样会有更好效果。
现在我们来书写插件的body部分:
$.fn.shuffleLetters = function(prop){ var options = $.extend({ "step" : 8, // How many times should the letters be changed "fps" : 25, // Frames Per Second "text" : "" // Use this text instead of the contents },prop) return this.each(function(){ var el = $(this), str = ""; if(options.text) { str = options.text.split(''); } else { str = el.text().split(''); } // The types array holds the type for each character; // Letters holds the positions of non-space characters; var types = [], letters = []; // Looping through all the chars of the string for(var i=0;ilen){ return; } // All the work gets done here for(i=Math.max(start,0); i < len; i++){ // The start argument and options.step limit // the characters we will be working on at once if( i < start+options.step){ // Generate a random character at this position strCopy[letters[i]] = randomChar(types[letters[i]]); } else { strCopy[letters[i]] = ""; } } el.text(strCopy.join("")); setTimeout(function(){ shuffle(start+1); },1000/options.fps); })(-options.step); }); };
这 个插件将可以接受被调用的DOM元素的内容,或者当作一个参数传入的对象的text属性。然后它分割字符串到字符,并且决定使用的类型。这个 shuffle功能使用setTimeout()来调用自己并且随机生成字符串,更新DOM元素。如果你不清楚setTimeout()的使用,可以参考 这篇文章:http://www.gbin1.com/technology/jqueryhowto/fadeoutonebyone/ , 调用seTimeout方法可以帮助你按特定时间间隔执行某些操作。
以上就是随机字符变换效果的jQuery插件开发教程的内容,更多相关内容请关注PHP中文网(www.php.cn)!

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