JavaScript有一个eval函数，它计算字符串并将其作为代码执行:

eval(settings.functionName + '(' + t.parentNode.id + ')');

因为我讨厌eval，而且我不是一个人:

var fn = window[settings.functionName];
if(typeof fn === 'function') {
    fn(t.parentNode.id);
}

Edit: In reply to @Mahan's comment: In this particular case, settings.functionName would be "clickedOnItem". This would, at runtime translate var fn = window[settings.functionName]; into var fn = window["clickedOnItem"], which would obtain a reference to function clickedOnItem (nodeId) {}. Once we have a reference to a function inside a variable, we can call this function by "calling the variable", i.e. fn(t.parentNode.id), which equals clickedOnItem(t.parentNode.id), which was what the OP wanted.

更完整的例子:

/* Somewhere: */
window.settings = {
  /* [..] Other settings */
  functionName: 'clickedOnItem'
  /* , [..] More settings */
};

/* Later */
function clickedOnItem (nodeId) {
  /* Some cool event handling code here */
}

/* Even later */
var fn = window[settings.functionName]; 
/* note that settings.functionName could also be written
   as window.settings.functionName. In this case, we use the fact that window
   is the implied scope of global variables. */
if(typeof fn === 'function') {
    fn(t.parentNode.id);
}

JavaScript有一个eval函数，它计算字符串并将其作为代码执行:

eval(settings.functionName + '(' + t.parentNode.id + ')');

eval("javascript code");

它在处理JSON时被广泛使用。

根据Nicolas Gauthier的回答:

var strng = 'someobj.someCallback';
var data = 'someData';

var func = window;
var funcSplit = strng.split('.');
for(i = 0;i < funcSplit.length;i++){
   //We maybe can check typeof and break the bucle if typeof != function
   func = func[funcSplit[i]];
}
func(data);

我花了一段时间才弄清楚，因为传统的窗口['someFunctionName']()一开始并不适合我。我的函数名是作为AJAX响应从数据库中提取的。此外，由于某种原因，我的函数是在窗口的作用域之外声明的，所以为了解决这个问题，我不得不重写我调用的函数

function someFunctionName() {}

to

window.someFunctionName = function() {}

从那里我可以调用window['someFunctionName']()轻松。我希望这能帮助到一些人!