Caused by: com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'name': was expecting ('true', 'false' or 'null')

var allData = {
　　　　　　　　　　name:"张三",
　　　　　　　　　　age:20
　　　　　　　　　};
$.ajax({
            type: "POST",
            url: "xxxx",
            contentType:‘application/json;charset=utf-8‘,
            data:JSON.stringify(allData),
            success: function (data) {
                alert(data);
            }
        });