跨域解决

        protected void Application_BeginRequest(object sender, EventArgs e)
        {
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
            if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
            {
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST");
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
                HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
                HttpContext.Current.Response.End();
            }
        }

$(document).ready(function () {
	$("button").click(function () {
		alert("clicked");
		var data = $("#txt").val();
		var postdata = {};
		var data_obj = {"BoolValue" : "true" , "StringValue": data}
		postdata["value"] =  data_obj; 

		var url = "https://tmdev01.tm00.com/testwcf/service1.svc/TestMethod";
		$.ajax({
			type: "POST",
			url: url,
			contentType: "application/json; charset=utf-8",
			data: JSON.stringify(postdata),
			dataType: "json",
			success: function(data) {console.log(data);},
			error: function(a,b,c) {console.log(a);}
		});
	});
});

　　

https://docs.microsoft.com/en-us/aspnet/web-api/overview/security/enabling-cross-origin-requests-in-web-api