Chrome 发送请求出错：TypeError: 将循环结构转换为 JSON。
Chrome 发送请求出错：TypeError: 将循环结构转换为 JSON。
我遇到了以下问题...
chrome.extension.sendRequest({
req: "getDocument",
docu: pagedoc,
name: 'name'
}, function(response){
var efjs = response.reply;
});
调用了以下内容...
case "getBrowserForDocumentAttribute":
alert("ZOMG HERE");
sendResponse({
reply: getBrowserForDocumentAttribute(request.docu,request.name)
});
break;
然而，我的代码从来没有到达过“ZOMG HERE”，而是在运行chrome.extension.sendRequest时抛出以下错误
Uncaught TypeError: Converting circular structure to JSON chromeHidden.JSON.stringify chrome.Port.postMessage chrome.initExtension.chrome.extension.sendRequest suggestQuery
有何人知道是什么原因造成的吗？
admin 更改状态以发布 2023年5月21日
根据Mozilla上的JSON文档，JSON.stringify有第二个参数replacer，可以在解析树时用来过滤/忽略子项。然而，在Node.js中，我们无法避免循环引用。所以我们可以像这样做：
function censor(censor) {
var i = 0;
return function(key, value) {
if(i !== 0 && typeof(censor) === 'object' && typeof(value) == 'object' && censor == value)
return '[Circular]';
if(i >= 29) // seems to be a harded maximum of 30 serialized objects?
return '[Unknown]';
++i; // so we know we aren't using the original object anymore
return value;
}
}
var b = {foo: {bar: null}};
b.foo.bar = b;
console.log("Censoring: ", b);
console.log("Result: ", JSON.stringify(b, censor(b)));
结果是：
Censoring: { foo: { bar: [Circular] } }
Result: {"foo":{"bar":"[Circular]"}}
不幸的是，在循环引用之前似乎有30次迭代的最大限制。否则，这个方法是可以工作的。我甚至从这里使用了areEquivalent，但是在30次迭代后，JSON.stringify仍然会抛出异常。但是，如果你真的需要，在顶层对象上，它足够好地描述了这个对象。也许有人可以改进这个方法？在Node.js中为HTTP请求对象，我得到了：
{
"limit": null,
"size": 0,
"chunks": [],
"writable": true,
"readable": false,
"_events": {
"pipe": [null, null],
"error": [null]
},
"before": [null],
"after": [],
"response": {
"output": [],
"outputEncodings": [],
"writable": true,
"_last": false,
"chunkedEncoding": false,
"shouldKeepAlive": true,
"useChunkedEncodingByDefault": true,
"_hasBody": true,
"_trailer": "",
"finished": false,
"socket": {
"_handle": {
"writeQueueSize": 0,
"socket": "[Unknown]",
"onread": "[Unknown]"
},
"_pendingWriteReqs": "[Unknown]",
"_flags": "[Unknown]",
"_connectQueueSize": "[Unknown]",
"destroyed": "[Unknown]",
"bytesRead": "[Unknown]",
"bytesWritten": "[Unknown]",
"allowHalfOpen": "[Unknown]",
"writable": "[Unknown]",
"readable": "[Unknown]",
"server": "[Unknown]",
"ondrain": "[Unknown]",
"_idleTimeout": "[Unknown]",
"_idleNext": "[Unknown]",
"_idlePrev": "[Unknown]",
"_idleStart": "[Unknown]",
"_events": "[Unknown]",
"ondata": "[Unknown]",
"onend": "[Unknown]",
"_httpMessage": "[Unknown]"
},
"connection": "[Unknown]",
"_events": "[Unknown]",
"_headers": "[Unknown]",
"_headerNames": "[Unknown]",
"_pipeCount": "[Unknown]"
},
"headers": "[Unknown]",
"target": "[Unknown]",
"_pipeCount": "[Unknown]",
"method": "[Unknown]",
"url": "[Unknown]",
"query": "[Unknown]",
"ended": "[Unknown]"
}
我创建了一个小的Node.js模块来实现这个功能：https://github.com/ericmuyser/stringy。欢迎大家改进/贡献！
