js对象序列化
JSON.stringify和JSON.parse()不能解析出循环的对象 如
var tem={a:2,b:2}
tem.c=tem;
这个时候JSON.parse会解析成 {'a':2,'b':2,'c':null}
有时候又想要这个对象 那怎么办喃?
var obj = { a: 1, b: 2, d:{a:1,b:3} } //不拷贝原型链 obj.c = obj; obj.d.c=obj.c; var getList = function(obj) { var me = this; me.list = []; me.obj = me.copy(obj); me.deal(); } getList.prototype = { constrctor: getList, copy(obj) { var me = this; if (typeof obj !== 'object') return obj var result = me.list.filter(i => i.v === obj); if (result.length) { return result[0].index; } me.list.push({ v: obj, index: me.list.length + '$crucle' }); var re; var test = {}.toString.call(obj); if (test === '[object Object]') { re = {}; Object.keys(obj).forEach(i => { re[i] = me.copy(obj[i]); }); return re; } if (test === '[object Array]') { re = obj.map(i => { return me.copy(i); }); return re; } }, deal() { var me = this; me.list.forEach(i => { me.cut(i.v); }); }, cut(obj) { var me = this; var test = {}.toString.call(obj); if (test === '[object Array]') { obj.forEach(i => { if (me.doCut(i)) { me.cut(i); } else { return; } }); } if (test === '[object Object]') { Object.keys(obj).forEach(i => { if (me.doCut(obj[i])) { me.cut(obj[i]); } else { return; } }) } }, doCut(obj) { var me = this; var result = me.list.filter(i => i.v === obj) if (result.length) { obj = result[0].index; return false; } return true; } } var result = new getList(obj); result.list.forEach(i => { i.v = null; }); var str = JSON.parse(JSON.stringify(result)); // console.log(str); var getObj = function(obj) { var me = this; me.old = obj.list; me.list = []; me.getOld(obj.obj); me.list.forEach(i => { me.reverseOld(i.v); }); return obj.obj; } getObj.prototype = { constructor: getObj, regexp:/crucle$/ig, getOld(obj) { var me = this; if (typeof obj !== "object") return; me.list.push({ index: me.list.length + '$crucle', v: obj }); var test = {}.toString.call(obj); if (test === '[object Object]') { Object.keys(obj).forEach(i => { me.getOld(obj[i]); }); return; } if (test === '[object Array]') { obj.forEach(i => { me.getOld(i); }) } }, reverseOld(obj) { var me = this; var test = {}.toString.call(obj); if (test==='[object Object]'){ Object.keys(obj).forEach(i=>{ var regexp=/crucle$/ig; if(typeof obj[i]==='string'&®exp.test(obj[i])){ var re=me.list.filter(j=>j.index===obj[i])[0]; obj[i]=re.v; return ; }else{ if (typeof obj === 'object') me.getOld(i); } }) } } } var reverse=new getObj(str); console.log(reverse);
没有拷贝原型链和函数对象 可以使用function.toString() 然后 使用 eval 可以得到结果