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;
}