javascript - 遍历arguments.callee.caller导致无限循环

假设我想获取某种堆栈跟踪信息，以获取在当前函数之前被调用的所有函数的名称。

我做这样的事情：

        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);

在大多数情况下，这都可以正常工作。但是有时它陷入无限循环，我想知道：这怎么可能？那我该怎么办？

这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: afterComponentInitialize

最佳答案

arguments.callee.caller指向函数引用，在每个调用堆栈中每个函数仅存在一个。

每次调用一个函数时，都会设置caller属性，这意味着，如果同一个函数在调用堆栈中被多次调用（与递归函数一样），则先前的值将被重置，而caller将被重置。现在指向自己。这就是导致您无限循环的原因。

因此，在您的算法中，如果到达callee === callee.caller的位置，则需要中断以免发生这种情况。

关于javascript - 遍历arguments.callee.caller导致无限循环，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/15582309/