javascript - json.stringify with circular references handling and functions.

jsonstringify.js

var cache = [];
var str = JSON.stringify({a: infer.registerFunction}, function(key, value) {
    if (typeof value === 'object' && value !== null) {
        if (cache.indexOf(value) !== -1) {
            return;
        }
        cache.push(value);
    }
    if (typeof value === 'function') {
      return '' + value;
    }
    return value;
})
cache = null;