var response = await $.ajax({type: 'POST',url: url,data: null,contentType: "application/json;charset=UTF-8",dataType: "json"})
如果后台返回的数据是JSON字符串
设置了dataType: "json"后,返回的response会自动转为JS对象。
var response = await $.ajax({type: 'POST',url: url,data: null,contentType: "application/json;charset=UTF-8",dataType: "json"})
如果后台返回的数据是JSON字符串