javascript中json和string互相转换

function jsonToString(obj){   
var THIS = this;    
switch(typeof(obj)){   
case \'string\':   
return \'"\' + obj.replace(/(["\\])/g, \'\\$1\') + \'"\';   
case \'array\':   
return \'[\' + obj.map(THIS.jsonToString).join(\',\') + \']\';   
case \'object\':   
if(obj instanceof Array){   
var strArr = [];   
var len = obj.length;   
for(var i=0; i<len; i++){   
                        strArr.push(THIS.jsonToString(obj[i]));   
                    }   
return \'[\' + strArr.join(\',\') + \']\';   
                }else if(obj==null){   
return \'null\';   

                }else{   
var string = [];   
for (var property in obj) string.push(THIS.jsonToString(property) + \':\' + THIS.jsonToString(obj[property]));   
return \'{\' + string.join(\',\') + \'}\';   
                }   
case \'number\':   
return obj;   
case false:   
return obj;   
        }   
    }

string转json，就很简单了，一句话

var yourJsonObj= eval("(" + yourString + ")");