function changeJSON2QueryString(JSON){
    var temp = [];
    for(var k in JSON){
        temp.push(k + "=" + encodeURIComponent(JSON[k]));
    }
    return temp.join("&");
}

var querystring = changeJSON2QueryString({
"yonghuming" : "小明",
"age" : 12,
"sex" : "男"
});
xhr.open("get","check.php?" + querystring , true
 
);

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