封装 type方法 判断 数据类型

function type(target) {

var ret = typeof target;

var obj = {

"[object Array]":"Array",

"[object Object]":"Object",

"[object String]":"String-obj",

"[object Number]":"Number-obj",

"[object Boolean]":"Boolean-obj"

}

if(target==null){

return "null"

}else if(ret =="object"){

var str = Object.prototype.toString.call(target);

return obj[str]

}else{

return typeof (target)

}

}