各类技术集锦

1、input只允许输入数字(一般用于金额使用)

 <input class="form-control" type="text" placeholder="请输入预计成本" autocomplete="off" onkeyup="value=value.replace(/[^\d.]/g,'').replace('.','$#$').replace(/\./g,'').replace('$#$','.')" />

 2、模拟http请求的参数类型 application/json

var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://url");
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";

using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
    string json = "{\"user\":\"test\"," +
                  "\"password\":\"bla\"}";

    streamWriter.Write(json);
    streamWriter.Flush();
    streamWriter.Close();
}

var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
    var result = streamReader.ReadToEnd();
}