JSON.stringify深层对象

我做了我最初担心的事情：我采用了Crockford的代码，并根据需要对其进行了修改。现在，它可以构建JSON但可以处理

• 周期
• 太深的物体
• 数组太长
• 异常（无法合法访问的访问器）

如果有人需要，我在GitHub上建立了一个GitHub存储库：JSON.prune

这是代码：

// JSON.pruned : a function to stringify any object without overflow// example : var json = JSON.pruned({a:'e', c:[1,2,{d:{e:42, f:'deep'}}]})// two additional optional parameters ://   - the maximal depth (default : 6)//   - the maximal length of arrays (default : 50)// GitHub : https://github.com/Canop/JSON.prune// This is based on Douglas Crockford's pre ( https://github.com/douglascrockford/JSON-js/blob/master/json2.js )(function () {    'use strict';    var DEFAULT_MAX_DEPTH = 6;    var DEFAULT_ARRAY_MAX_LENGTH = 50;    var seen; // Same variable used for all stringifications    Date.prototype.toPrunedJSON = Date.prototype.toJSON;    String.prototype.toPrunedJSON = String.prototype.toJSON;    var cx = /[u0000u00adu0600-u0604u070fu17b4u17b5u200c-u200fu2028-u202fu2060-u206fufeffufff0-uffff]/g,        escapable = /[\"x00-x1fx7f-x9fu00adu0600-u0604u070fu17b4u17b5u200c-u200fu2028-u202fu2060-u206fufeffufff0-uffff]/g,        meta = {    // table of character substitutions 'b': '\b', 't': '\t', 'n': '\n', 'f': '\f', 'r': '\r', '"' : '\"', '\': '\'        };    function quote(string) {        escapable.lastIndex = 0;        return escapable.test(string) ? '"' + string.replace(escapable, function (a) { var c = meta[a]; return typeof c === 'string'     ? c     : '\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);        }) + '"' : '"' + string + '"';    }    function str(key, holder, depthDecr, arrayMaxLength) {        var i,          // The loop counter. k,          // The member key. v,          // The member value. length, partial, value = holder[key];        if (value && typeof value === 'object' && typeof value.toPrunedJSON === 'function') { value = value.toPrunedJSON(key);        }        switch (typeof value) {        case 'string': return quote(value);        case 'number': return isFinite(value) ? String(value) : 'null';        case 'boolean':        case 'null': return String(value);        case 'object': if (!value) {     return 'null'; } if (depthDecr<=0 || seen.indexOf(value)!==-1) {     return '"-pruned-"'; } seen.push(value); partial = []; if (Object.prototype.toString.apply(value) === '[object Array]') {     length = Math.min(value.length, arrayMaxLength);     for (i = 0; i < length; i += 1) {         partial[i] = str(i, value, depthDecr-1, arrayMaxLength) || 'null';     }     v = partial.length === 0         ? '[]'         : '[' + partial.join(',') + ']';     return v; } for (k in value) {     if (Object.prototype.hasOwnProperty.call(value, k)) {         try {  v = str(k, value, depthDecr-1, arrayMaxLength);  if (v) partial.push(quote(k) + ':' + v);         } catch (e) {   // this try/catch due to some "Accessing selectionEnd on an input element that cannot have a selection." on Chrome         }     } } v = partial.length === 0     ? '{}'     : '{' + partial.join(',') + '}'; return v;        }    }    JSON.pruned = function (value, depthDecr, arrayMaxLength) {        seen = [];        depthDecr = depthDecr || DEFAULT_MAX_DEPTH;        arrayMaxLength = arrayMaxLength || DEFAULT_ARRAY_MAX_LENGTH;        return str('', {'': value}, depthDecr, arrayMaxLength);    };}());

一个可以做什么的例子：

var json = JSON.pruned(window);

注意：
与该答案中的代码相反，GitHub存储库在需要时进行更新（文档，兼容性，在commonjs或节点中用作模块，特定的序列化等）。如果需要此修剪功能，则从存储库开始是个好主意。