1、isString
1 var isString1 = function (obj){
2 return Object.prototype.toString.call(obj)==="[object String]";
3 };
4
5
6 var isString2 = function(obj){
7 return (typeof obj==="string")
8 };
9
10
11 var isString3 = function (obj) {
12 return ("" + obj) === obj;
13 };
2、isArray
1 var isArray1 = function(obj){
2 return Object.prototype.toString.call(obj)==="[object Array]"
3 };
4
5 var isArray2 = function(obj){
6 return obj instanceof Array;
7 };
8
9 var isArray3 = function(obj){
10 return Array.isArray(obj); //需要浏览器支持
11 };
3、其他
1 var toString = Object.prototype.toString;
2
3
4 //判读一个对象是一个对象
5 _.isObject = function(obj) {
6 var type = typeof obj;
7 return type === 'function' || type === 'object' && !!obj;
8 };
9
10 // isArguments, isFunction, isString, isNumber, isDate, isRegExp, isError.
11 _.each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp', 'Error'], function(name) {
12 _['is' + name] = function(obj) {
13 return toString.call(obj) === '[object ' + name + ']';
14 };
15 });
