遍历arguments.callee.caller会导致无限循环
遍历arguments.callee.caller会导致无限循环
提问于 2013-03-23 09:22:49
假设我想要获取某种堆栈跟踪，获取在当前函数之前调用的所有函数的名称。
我这样做：
var callee;
var caller;
var _args = arguments;
var check = 0;
do {
check++;
callee = _args.callee;
caller = callee.caller;
var msg = 'Check ' + check + ' - ' + callee.name
+ ' has been called by: ' + caller.name;
console.log(msg);
if (caller) {
// Get this caller's arguments
_args = caller.arguments;
} else {
reached_end = true;
}
} while (!reached_end);这在大多数情况下都运行得很好。但有时它会陷入无限循环，我想知道:这是怎么可能的？我能做些什么呢？
下面是我的无限循环的输出：
Check 1 - __parent__ has been called by: add
Check 2 - add has been called by: afterComponentStartup
Check 3 - afterComponentStartup has been called by: _launchComponents [arg0:"startup"]
Check 4 - _launchComponents has been called by: beforeActionNext
Check 5 - beforeActionNext has been called by: beforeAction
Check 6 - beforeAction has been called by: afterComponentInitialize
Check 7 - afterComponentInitialize has been called by: _launchComponents [arg0:"startup"]
Check 8 - _launchComponents has been called by: beforeActionNext
Check 9 - beforeActionNext has been called by: beforeAction
Check 10 - beforeAction has been called by: afterComponentInitialize
Check 11 - afterComponentInitialize has been called by: _launchComponents [arg0:"startup"]
Check 12 - _launchComponents has been called by: beforeActionNext
Check 13 - beforeActionNext has been called by: beforeAction
Check 14 - beforeAction has been called by: afterComponentInitialize
Check 15 - afterComponentInitialize has been called by: _launchComponents [arg0:"startup"]
Check 16 - _launchComponents has been called by: beforeActionNext
Check 17 - beforeActionNext has been called by: beforeAction
Check 18 - beforeAction has been called by: afterComponentInitialize
Check 19 - afterComponentInitialize has been called by: _launchComponents [arg0:"startup"]
Check 20 - _launchComponents has been called by: beforeActionNext
Check 21 - beforeActionNext has been called by: beforeAction
Check 22 - beforeAction has been called by: afterComponentInitialize
Check 23 - afterComponentInitialize has been called by: _launchComponents [arg0:"startup"]
Check 24 - _launchComponents has been called by: beforeActionNext
Check 25 - beforeActionNext has been called by: beforeAction
Check 26 - beforeAction has been called by: afterComponentInitializeStack Overflow用户
回答已采纳
发布于 2013-03-23 10:02:29
arguments.callee.caller指向函数引用，它只存在于每个调用堆栈中的每个函数中的一个。
每次调用函数时，都会设置caller属性，这意味着如果同一函数在调用堆栈中被多次调用(递归函数会发生这种情况)，则先前的值将被重置，并且caller现在将指向自身。这就是导致无限循环的原因。
所以在你的算法中，如果你达到了callee === callee.caller的点，你需要中断，这样才不会发生这种情况。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/15582309
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