js对象转json字符串

//js对象转字符串
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();
	}
}