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                - <a class="one" href="#">click</a><br />
 - <a class="two" href="#">click</a><br />
 - <a class="three" href="#">click</a><br />
 - $(document).ready(function() {
 - help = function(var1) {
 - alert(var1);
 - }
 - function help2(var1) {
 - alert(var1);
 - }
 - $('a.one').click(function() {
 - var functionName = "help";
 - if ($.isFunction([functionName])) {[functionName]("hello");
 - } else {
 - alert("not a function");
 - }
 - return false;
 - });
 - $('a.two').click(function() {
 - var functionName = "help";
 - if ($.isFunction(functionName)) {
 - functionName("hello");
 - } else {
 - alert("not a function");
 - }
 - return false;
 - });
 - $('a.three').click(function() {
 - var functionName = "help2";
 - if ($.isFunction(functionName)) {
 - functionName("hello");
 - } else {
 - alert("not a function");
 - }
 - return false;
 - });
 - $('a.four').click(function() {
 - var functionName = "help2";
 - if ($.isFunction([functionName])) {[functionName]("hello");
 - } else {
 - alert("not a function");
 - }
 - return false;
 - });
 - });
 - var functionName = "help";
 - if ($.isFunction(window[functionName])) {
 - window[functionName]("hello");
 - } else {
 - alert("not a function");
 - }
 - if ($.isFunction(window[functionName])) {
 - window[functionName]("hello");
 - }
 - var namespace = {
 - help: function (var1) {
 - alert(var1);
 - },
 - help2: function (var1) {
 - alert(var1);
 - }
 - }
 - $(document).ready(function() {
 - var functionName = "help";
 - if ($.isFunction(namespace[functionName])) {
 - namespace[functionName]("hello");
 - }
 - });
 - <a class="one" href="#">click</a><br />
 - var help = function(var1) {
 - alert(var1);
 - }
 - $(document).ready(function() {
 - $('a.one').click(function() {
 - var functionName = help;
 - if ($.isFunction(functionName)) {
 - functionName('test');
 - } else {
 - alert("not a function");
 - }
 - return false;
 - });
 - });
 
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