js jquery vue 如何设置ajax请求的content-type？

首先我们看jquery的ajax设置content-type，我们设置content-type为application/json;代码如下：

$.ajax({
  type: "POST",
  url: "test.php",
   data: JSON.stringify({
      username: "111", "password": "123"
    }),
   dataType: "json",
   contentType: "application/json;charset=utf-8",
   success: function(data) {
                    if (!data.err) {
                        console.log(data.msg);
                    } else {
                        console.log("出现错误：" + data.msg);
                    }
                },
                error: function(jqXHR) {
                    alert("发生错误：" + jqXHR.status);

                },
 });

        var request = new XMLHttpRequest();
        request.open("POST", "test.php");

        request.setRequestHeader("Content-type", "application/json");
        request.send(JSON.stringify({
            username: "111", "pas...

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