JS - JSON 相关的坑

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

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

// 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