js获取cookie

//获取cookie
function getCookie(name) {
var arr = document.cookie.split('; ');
for ( var i = 0; i < arr.length; i++) {
var arr2 = arr[i].split('='); //['abc','cba']
if (arr2[0] == name) {
return arr2[1];
console.log(arr2[1]);
}
}
return '';
}

var openid = getCookie("user_openid");