js对象转json数组的简单实现案例

function obj2Str(obj){ 
switch(typeof(obj)){ 
case 'object': 
var ret = []; 
if (obj instanceof Array){ 
for (var i = 0, len = obj.length; i < len; i++){ 
ret.push(obj2Str(obj[i])); 
} 
return '[' + ret.join(',') + ']'; 
} 
else if (obj instanceof RegExp){ 
return obj.toString(); 
} 
else{ 
for (var a in obj){ 
ret.push(a + ':' + obj2Str(obj[a])); 
} 
return '{' + ret.join(',') + '}'; 
} 
case 'function': 
return 'function() {}'; 
case 'number': 
return obj.toString(); 
case 'string': 
return "\"" + obj.replace(/(\\|\")/g, "\\$1").replace(/\n|\r|\t/g, function(a) {return ("\n"==a)?"\\n":("\r"==a)?"\\r":("\t"==a)?"\\t":"";}) + "\""; 
case 'boolean': 
return obj.toString(); 
default: 
return obj.toString(); 
} 
}