express 做跨域请求
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无论什么语言下，做跨域的核心就是 "Access-Control-Allow-Origin" 设置为"*"
在Express下是这么干的
var app = express();
app.all('/api', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
res.header("X-Powered-By",' 3.2.1')
res.header("Content-Type", "application/json;charset=utf-8");
next();
});
这样就 OK 了
