js 检测 数据类型封装

代码展示：

function type(target) {
    var template = {
        "[object Array]" : "array",
        "[object Object]" : "object",
        "[object Number]" : "number - object",
        "[object Boolean]" : "boolean - object",
        "[object String]" : "string - object"
    }
　　　//判断null类型
    if(target === null){
        return null;
    }
    if(typeof(target) == "object"){
        var str = Object.prototype.toString.call(target);
        return template[str];
    }else{
        return typeof(target);
    }
}

　　结果展示：

　　

　　代码优化：

　　　　

function type(target) {
    var ret = typeof (target)，
    template = {
        "[object Array]": "array",
        "[object Object]": "object",
        "[object Number]": "number - object",
        "[object Boolean]": "boolean - object",
        "[object String]": "string - object",
    }，
    str = Object.prototype.toString.call(target);
    return (target === null)?null:(ret == "object") ? template[str] : ret;
}