Detailed explanation of the steps to implement JSON.stringify in JS
这次给大家带来JS实现JSON.stringify步骤详解，JS实现JSON.stringify的注意事项有哪些，下面就是实战案例，一起来看一下。
JSON.stringify是浏览器高版本带的一个将JS的Objtect对象转换为JSON字符串的一个方法，不过再IE6下面，并不存在JSON这一对象，因此，用到此方法时，需要写一套兼容性的代码。接下来通过本文给大家分享JS实现JSON.stringify的实例代码，需要的朋友参考下吧
JSON.stringify是浏览器高版本带的一个将JS的Objtect对象转换为JSON字符串的一个方法，不过再IE6下面，并不存在JSON这一对象，因此，用到此方法时，需要写一套兼容性的代码。 JSON.stringify的一些规则以及注意点:当对象为数字，null,boolean的时候，直接转换为相应的字符串就可以了。 但是string,function,undefined,object,array等，需要特殊处理。
1.undefined,该类型使用JSON.stringify处理的时候，如果对象就是undefined,将会输出"undefined",如果对象是数组的元素，那么将会变成null，比如:[undefined],stringify之后变成了"[null]";如果该对象是object的元素，那么该属性将当作不存在，不输出，比如{a:1,b:undefined},stringify之后是"{\"a\":1},B属性直接抛弃。
2.字符串在拼接的时候需要把内部的双引号处理掉
/**
* JSON stringify的实现
* @author norkts<norkts@gmail.com>
* @version 1.0 2015-11-24 15:11 实现了基本功能
* @version 1.1 2015-11-24 15:19 norkts 增加了JSON.stringify的兼用代码实现
* @version 1.2 2015-11-24 15:49 norkts 修改数组indexOf在IE下不兼容的写法,修改了undefined值的特殊处理
*/
(function(NS){
//简单类型
var simpleTypes = ["number", "boolean", "undefined", "string", "function"];
//JSON.stringify的主函数
function stringify(object){
var type = typeof object;
//如果是简单类型，则直接返回简单类型的结果
if(indexOf(simpleTypes, type) > -1){
return parseSimpleObject(object);
}
//数组对象的
if(object instanceof Array){
var len = object.length;
var resArr = [];
for(var i = 0; i < len; i++){
var itemType = typeof object[i];
if(indexOf(simpleTypes, itemType) > -1){
//undefined特殊处理，数组中变成null
if(itemType != "undefined"){
resArr.push(parseSimpleObject(object[i]));
}else{
resArr.push("null");
}
}else{
//递归处理JS数组中的复杂元素
resArr.push(stringify(object[i]));
}
}
return "[" + resArr.join(",") + "]";
}
//普通object对象
if(object instanceof Object){
if(object == null){
return "null";
}
var resArr = [];
for(var name in object){
var itemType = typeof object[name];
if(indexOf(simpleTypes, itemType) > -1){
//undefined特殊处理，object中不编码
if(itemType != "undefined"){
resArr.push("\"" + name + "\":" + parseSimpleObject(object[name]));
}
}else{
resArr.push("\"" + name + "\":" + stringify(object[name]));
}
}
return "{" + resArr.join(",") + "}";
}
}
function parseSimpleObject(object){
var type = typeof object;
if(type == "string" || type == "function"){
return "\"" + object.toString().replace("\"", "\\\"") + "\"";
}
if(type == "number" || type == "boolean"){
return object.toString();
}
if(type == "undefined"){
return "undefined";
}
return "\"" + object.toString().replace("\"", "\\\"") + "\"";
}
function indexOf(arr, val){
for(var i = 0; i < arr.length; i++){
if(arr[i] === val){
return i;
}
}
return -1;
}
/**
* 将stringify做二次封装
* @param object 要处理的对象
*
*/
NS.stringify = function(object, isEncodeZh){
var res = stringify(object);
if(isEncodeZh){
var encodeRes = "";
for(var i = 0; i < res.length; i++){
if(res.charCodeAt(i) < 0xff){
encodeRes += res[i];
}else{
encodeRes += "\\u" + res.charCodeAt(i).toString(16);
}
}
res = encodeRes;
}
return res;
};
})(window);相信看了本文案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！
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