一.判断是否为数组类型

var a=[0]; 
document.write(isArray(a),'<br/>'); 
function isArray(obj){ 
    return (typeof obj=='object')&&obj.constructor==Array; 
}

二.判断是否为字符串类型

document.write(isString('test'),'<br/>'); 
document.write(isString(10),'<br/>'); 
function isString(str){ 
    return (typeof str=='string')&&str.constructor==String; 
} 

三.判断是否为数值类型

document.write(isNumber('test'),'<br/>'); 
document.write(isNumber(10),'<br/>'); 
function isNumber(obj){ 
    return (typeof obj=='number')&&obj.constructor==Number; 
} 

四.判断是否为日期类型

document.write(isDate(10),'<br/>'); 
function isDate(obj){ 
    return (typeof obj=='object')&&obj.constructor==Date; 
} 

五.判断是否为函数

document.write(isFunction(10),'<br/>'); 
function isFunction(obj){ 
    return (typeof obj=='function')&&obj.constructor==Function; 
}  

六.判断是否为对象

document.write(isObject(new Object()),'<br/>'); 
document.write(isObject(10),'<br/>'); 
function isObject(obj){ 
    return (typeof obj=='object')&&obj.constructor==Object; 
}

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