js获取URL上的？值

获取URL上的值

推荐方案：正则表达式判断获取

function getUrlValue(name) {
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
    var r = window.location.search.substr(1).match(reg); //获取url中"?"符后的字符串并正则匹配
    var context = "";
    if (r != null)
        context = decodeURIComponent(r[2]);
    reg = null;
    r = null;
    return context == null || context == "" || context == "undefined" ? "" : context;
}

如：
http://localhost:8080/abc.html?name=张三&age=18
let name = getUrlValue("name");  //name = 张三
let age = getUrlValue("age");  //age = 18

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