z在请求本地的时候 如果ajax的URL 前面没有http的话 就会报错
jq.js:2 XMLHttpRequest cannot load localhost:3000/test_date/. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.
原文：http://www.cnblogs.com/wanghaonull/p/6844714.html