JS isArray记录

var isArray=Function.isArray||function(0){

    return typeof o === "object" &&

    Object.prototype.toString.call(0)==="[object Array]"  ;

}

类数组对象,如：{1:"ab",2:"cd",3:"ef"}

function isArrayLike(o){

  if(o && typeof o==="object" && isFinite(o.length) &&

     o.length>=0 &&

     o.length===Math.floor(o.length) &&

     o.length<4294967296)

     return true;

  else

     return false;

}