javascript - 加入并替换多次出现的字符串

Question

我有这个字符串:

var data = "res_per_page=10&page_num=1&location_id=107&location_id=174&location_id=110&location_id=180"

我想将所有“location_id”参数归为一个，用_ 分隔。如何实现？结果字符串应如下所示:

var data = "res_per_page=10&page_num=1&location_id=107_174_110_180"

Answer 1

怎么样; (假设 id 是 1 到 9 位数字)

var newdata = [];
data = data.replace(/&?location_id=(\d{1,9})/ig, function(m, k, v) {
        newdata.push(k);
        return "";
    });
data += "&location_id=" + newdata.join("_");
alert(data);


in:  "res_per_page=10&page_num=1&location_id=107&location_id=174&location_id=110&location_id=180"
out: "res_per_page=10&page_num=1&location_id=107_174_110_180"