JSON.stringify打印循环引用的object对象报错

JSON.stringify打印循环引用的object对象报错

循环引用的obj数据，如果直接打印就是空，使用JSON转换打印会报错无法转换

Converting circular structure to JSON --> starting at object with constructor 'Socket'

1. 临时处理方案，覆写JSON的stringify方法再使用，引用数据会变成"client":"[Circular socket]"

   var handleCircular = function() {
   var cache = [];
   var keyCache = []
   return function(key, value) {
   if (typeof value === 'object' && value !== null) {
   var index = cache.indexOf(value);
   if (index !== -1) {
   return '[Circular ' + keyCache[index] + ']';
   }
   cache.push(value);
   keyCache.push(key || 'root');
   }
   return value;
   }
   }

var tmp = JSON.stringify;
JSON.stringify = function(value, replacer, space) {
replacer = replacer || handleCircular();
return tmp(value, replacer, space);
}