自己封装typeof方法

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