标记在IE8以下时使用JSON.stringify报JSON未定义错误的问题

调用的页面里引用json2.js即可解决问题(推荐方法)。

即:<script type="text/JavaScript" src="js/json2.js"></script>

json2.js如下：

// json2.js
	// 2017-06-12
	// Public Domain.
	// NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
	// USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
	// NOT CONTROL.
	// This file creates a global JSON object containing two methods: stringify
	// and parse. This file provides the ES5 JSON capability to ES3 systems.
	// If a project might run on IE8 or earlier, then this file should be included.
	// This file does nothing on ES5 systems.
	// JSON.stringify(value, replacer, space)
	// value any JavaScript value, usually an object or array.
	// replacer an optional parameter that determines how object
	// values are stringified for objects. It can be a
	// function or an array of strings.
	// space an optional parameter that specifies the indentation
	// of nested structures. If it is omitted, the text will
	// be packed without extra whitespace. If it is a number,
	// it will specify the number of spaces to indent at each
	// level. If it is a string (such as "\t" or " "),
	// it contains the characters used to indent at each level.
	// This method produces a JSON text from a JavaScript value.
	// When an object value is found, if the object contains a toJSON
	// method, its toJSON method will be called and the result will be
	// stringified. A toJSON method does not serialize: it returns the
	// value represented by the name/value pair that should be serialized,
	// or undefined if nothing should be serialized. The toJSON method
	// will be passed the key associated with the value, and this will be
	// bound to the value.
	// For example, this would serialize Dates as ISO strings.
	// Date.prototype.toJSON = function (key) {
	// function f(n) {
	// // Format integers to have at least two digits.
	// return (n < 10)
	// ? "0" + n
	// : n;
	// }
	// return this.getUTCFullYear() + "-" +
	// f(this.getUTCMonth() + 1) + "-" +
	// f(this.getUTCDate()) + "T" +
	// f(this.getUTCHours()) + ":" +
	// f(this.getUTCMinutes()) + ":" +
	// f(this.getUTCSeconds()) + "Z";
	// };
	// You can provide an optional replacer method. It will be passed the
	// key and value of each member, with this bound to the containing
	// object. The value that is returned from your method will be
	// serialized. If your method returns undefined, then the member will
	// be excluded from the serialization.
	// If the replacer parameter is an array of strings, then it will be
	// used to select the members to be serialized. It filters the results
	// such that only members with keys listed in the replacer array are
	// stringified.
	// Values that do not have JSON representations, such as undefined or
	// functions, will not be serialized. Such values in objects will be
	// dropped; in arrays they will be replaced with null. You can use
	// a replacer function to replace those with JSON values.
	// JSON.stringify(undefined) returns undefined.
	// The optional space parameter produces a stringification of the
	// value that is filled with line breaks and indentation to make it
	// easier to read.
	// If the space parameter is a non-empty string, then that string will
	// be used for indentation. If the space parameter is a number, then
	// the indentation will be that many spaces.
	// Example:
	// text = JSON.stringify(["e", {pluribus: "unum"}]);
	// // text is '["e",{"pluribus":"unum"}]'
	// text = JSON.stringify(["e", {pluribus: "unum"}], null, "\t");
	// // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
	// text = JSON.stringify([new Date()], function (key, value) {
	// return this[key] instanceof Date
	// ? "Date(" + this[key] + ")"
	// : value;
	// });
	// // text is '["Date(---current time---)"]'
	// JSON.parse(text, reviver)
	// This method parses a JSON text to produce an object or array.
	// It can throw a SyntaxError exception.
	// The optional reviver parameter is a function that can filter and
	// transform the results. It receives each of the keys and values,
	// and its return value is used instead of the original value.
	// If it returns what it received, then the structure is not modified.
	// If it returns undefined then the member is deleted.
	// Example:
	// // Parse the text. Values that look like ISO date strings will
	// // be converted to Date objects.
	// myData = JSON.parse(text, function (key, value) {
	// var a;
	// if (typeof value === "string") {
	// a =
	// /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
	// if (a) {
	// return new Date(Date.UTC(
	// +a[1], +a[2] - 1, +a[3], +a[4], +a[5], +a[6]
	// ));
	// }
	// return value;
	// }
	// });
	// myData = JSON.parse(
	// "[\"Date(09/09/2001)\"]",
	// function (key, value) {
	// var d;
	// if (
	// typeof value === "string"
	// && value.slice(0, 5) === "Date("
	// && value.slice(-1) === ")"
	// ) {
	// d = new Date(value.slice(5, -1));
	// if (d) {
	// return d;
	// }
	// }
	// return value;
	// }
	// );
	// This is a reference implementation. You are free to copy, modify, or
	// redistribute.
	/*jslint
	eval, for, this
	*/
	/*property
	JSON, apply, call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
	getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
	lastIndex, length, parse, prototype, push, replace, slice, stringify,
	test, toJSON, toString, valueOf
	*/
	// Create a JSON object only if one does not already exist. We create the
	// methods in a closure to avoid creating global variables.
	if (typeof JSON !== "object") {
	JSON = {};
	}
	(function () {
	"use strict";
	var rx_one = /^[\],:{}\s]*$/;
	var rx_two = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g;
	var rx_three = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
	var rx_four = /(?:^|:|,)(?:\s*\[)+/g;
	var rx_escapable = /[\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
	var rx_dangerous = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
	function f(n) {
	// Format integers to have at least two digits.
	return (n < 10)
	? "0" + n
	: n;
	}
	function this_value() {
	return this.valueOf();
	}
	if (typeof Date.prototype.toJSON !== "function") {
	Date.prototype.toJSON = function () {
	return isFinite(this.valueOf())
	? (
	this.getUTCFullYear()
	+ "-"
	+ f(this.getUTCMonth() + 1)
	+ "-"
	+ f(this.getUTCDate())
	+ "T"
	+ f(this.getUTCHours())
	+ ":"
	+ f(this.getUTCMinutes())
	+ ":"
	+ f(this.getUTCSeconds())
	+ "Z"
	)
	: null;
	};
	Boolean.prototype.toJSON = this_value;
	Number.prototype.toJSON = this_value;
	String.prototype.toJSON = this_value;
	}
	var gap;
	var indent;
	var meta;
	var rep;
	function quote(string) {
	// If the string contains no control characters, no quote characters, and no
	// backslash characters, then we can safely slap some quotes around it.
	// Otherwise we must also replace the offending characters with safe escape
	// sequences.
	rx_escapable.lastIndex = 0;
	return rx_escapable.test(string)
	? "\"" + string.replace(rx_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) {
	// Produce a string from holder[key].
	var i; // The loop counter.
	var k; // The member key.
	var v; // The member value.
	var length;
	var mind = gap;
	var partial;
	var value = holder[key];
	// If the value has a toJSON method, call it to obtain a replacement value.
	if (
	value
	&& typeof value === "object"
	&& typeof value.toJSON === "function"
	) {
	value = value.toJSON(key);
	}
	// If we were called with a replacer function, then call the replacer to
	// obtain a replacement value.
	if (typeof rep === "function") {
	value = rep.call(holder, key, value);
	}
	// What happens next depends on the value's type.
	switch (typeof value) {
	case "string":
	return quote(value);
	case "number":
	// JSON numbers must be finite. Encode non-finite numbers as null.
	return (isFinite(value))
	? String(value)
	: "null";
	case "boolean":
	case "null":
	// If the value is a boolean or null, convert it to a string. Note:
	// typeof null does not produce "null". The case is included here in
	// the remote chance that this gets fixed someday.
	return String(value);
	// If the type is "object", we might be dealing with an object or an array or
	// null.
	case "object":
	// Due to a specification blunder in ECMAScript, typeof null is "object",
	// so watch out for that case.
	if (!value) {
	return "null";
	}
	// Make an array to hold the partial results of stringifying this object value.
	gap += indent;
	partial = [];
	// Is the value an array?
	if (Object.prototype.toString.apply(value) === "[object Array]") {
	// The value is an array. Stringify every element. Use null as a placeholder
	// for non-JSON values.
	length = value.length;
	for (i = 0; i < length; i += 1) {
	partial[i] = str(i, value) || "null";
	}
	// Join all of the elements together, separated with commas, and wrap them in
	// brackets.
	v = partial.length === 0
	? "[]"
	: gap
	? (
	"[\n"
	+ gap
	+ partial.join(",\n" + gap)
	+ "\n"
	+ mind
	+ "]"
	)
	: "[" + partial.join(",") + "]";
	gap = mind;
	return v;
	}
	// If the replacer is an array, use it to select the members to be stringified.
	if (rep && typeof rep === "object") {
	length = rep.length;
	for (i = 0; i < length; i += 1) {
	if (typeof rep[i] === "string") {
	k = rep[i];
	v = str(k, value);
	if (v) {
	partial.push(quote(k) + (
	(gap)
	? ": "
	: ":"
	) + v);
	}
	}
	}
	} else {
	// Otherwise, iterate through all of the keys in the object.
	for (k in value) {
	if (Object.prototype.hasOwnProperty.call(value, k)) {
	v = str(k, value);
	if (v) {
	partial.push(quote(k) + (
	(gap)
	? ": "
	: ":"
	) + v);
	}
	}
	}
	}
	// Join all of the member texts together, separated with commas,
	// and wrap them in braces.
	v = partial.length === 0
	? "{}"
	: gap
	? "{\n" + gap + partial.join(",\n" + gap) + "\n" + mind + "}"
	: "{" + partial.join(",") + "}";
	gap = mind;
	return v;
	}
	}
	// If the JSON object does not yet have a stringify method, give it one.
	if (typeof JSON.stringify !== "function") {
	meta = { // table of character substitutions
	"\b": "\\b",
	"\t": "\\t",
	"\n": "\\n",
	"\f": "\\f",
	"\r": "\\r",
	"\"": "\\\"",
	"\\": "\\\\"
	};
	JSON.stringify = function (value, replacer, space) {
	// The stringify method takes a value and an optional replacer, and an optional
	// space parameter, and returns a JSON text. The replacer can be a function
	// that can replace values, or an array of strings that will select the keys.
	// A default replacer method can be provided. Use of the space parameter can
	// produce text that is more easily readable.
	var i;
	gap = "";
	indent = "";
	// If the space parameter is a number, make an indent string containing that
	// many spaces.
	if (typeof space === "number") {
	for (i = 0; i < space; i += 1) {
	indent += " ";
	}
	// If the space parameter is a string, it will be used as the indent string.
	} else if (typeof space === "string") {
	indent = space;
	}
	// If there is a replacer, it must be a function or an array.
	// Otherwise, throw an error.
	rep = replacer;
	if (replacer && typeof replacer !== "function" && (
	typeof replacer !== "object"
	|| typeof replacer.length !== "number"
	)) {
	throw new Error("JSON.stringify");
	}
	// Make a fake root object containing our value under the key of "".
	// Return the result of stringifying the value.
	return str("", {"": value});
	};
	}
	// If the JSON object does not yet have a parse method, give it one.
	if (typeof JSON.parse !== "function") {
	JSON.parse = function (text, reviver) {
	// The parse method takes a text and an optional reviver function, and returns
	// a JavaScript value if the text is a valid JSON text.
	var j;
	function walk(holder, key) {
	// The walk method is used to recursively walk the resulting structure so
	// that modifications can be made.
	var k;
	var v;
	var value = holder[key];
	if (value && typeof value === "object") {
	for (k in value) {
	if (Object.prototype.hasOwnProperty.call(value, k)) {
	v = walk(value, k);
	if (v !== undefined) {
	value[k] = v;
	} else {
	delete value[k];
	}
	}
	}
	}
	return reviver.call(holder, key, value);
	}
	// Parsing happens in four stages. In the first stage, we replace certain
	// Unicode characters with escape sequences. JavaScript handles many characters
	// incorrectly, either silently deleting them, or treating them as line endings.
	text = String(text);
	rx_dangerous.lastIndex = 0;
	if (rx_dangerous.test(text)) {
	text = text.replace(rx_dangerous, function (a) {
	return (
	"\\u"
	+ ("0000" + a.charCodeAt(0).toString(16)).slice(-4)
	);
	});
	}
	// In the second stage, we run the text against regular expressions that look
	// for non-JSON patterns. We are especially concerned with "()" and "new"
	// because they can cause invocation, and "=" because it can cause mutation.
	// But just to be safe, we want to reject all unexpected forms.
	// We split the second stage into 4 regexp operations in order to work around
	// crippling inefficiencies in IE's and Safari's regexp engines. First we
	// replace the JSON backslash pairs with "@" (a non-JSON character). Second, we
	// replace all simple value tokens with "]" characters. Third, we delete all
	// open brackets that follow a colon or comma or that begin the text. Finally,
	// we look to see that the remaining characters are only whitespace or "]" or
	// "," or ":" or "{" or "}". If that is so, then the text is safe for eval.
	if (
	rx_one.test(
	text
	.replace(rx_two, "@")
	.replace(rx_three, "]")
	.replace(rx_four, "")
	)
	) {
	// In the third stage we use the eval function to compile the text into a
	// JavaScript structure. The "{" operator is subject to a syntactic ambiguity
	// in JavaScript: it can begin a block or an object literal. We wrap the text
	// in parens to eliminate the ambiguity.
	j = eval("(" + text + ")");
	// In the optional fourth stage, we recursively walk the new structure, passing
	// each name/value pair to a reviver function for possible transformation.
	return (typeof reviver === "function")
	? walk({"": j}, "")
	: j;
	}
	// If the text is not JSON parseable, then a SyntaxError is thrown.
	throw new SyntaxError("JSON.parse");
	};
	}
	}());