javascript中json和string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，一句话

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