回车和换行
JSON 无法处理回车和换行，例如下面的语句会报错
js
JSON.parse({ a: "\r" });
\r:\x0D回车 CR (Carriage Return)\n:\x0A换行 LF (Line Feed)
JSON.stringify 出现：Converting circular structure to JSON
js
// Note: cache should not be re-used by repeated calls to JSON.stringify.
var cache = [];
JSON.stringify(obj, function(key, value) {
if (typeof value === "object" && value !== null) {
if (cache.indexOf(value) !== -1) {
// Circular reference found, discard key
return;
}
// Store value in our collection
cache.push(value);
}
return value;
});
cache = null; // Enable garbage collection