JavaScript getの文字化け問題の解決方法

function getQueryVariable(variable) {
    var query = window.location.search.substring(1);
    var vars = query.split("&");
    for (var i = 0; i < vars.length; i++) {
        var pair = vars[i].split("=");
        if (pair[0] == variable) {
            return pair[1];
        }
    }
    return (false);
}
let value=getQueryVariable(&#39;name&#39;);
console.log(value);
//此函数若想解决乱码问题需要使用decodeURIComponent()方法再次处理下
let value = getQueryVariable(&#39;name&#39;);
value = decodeURIComponent(value);
console.log(value);

//采用正则匹配方式
function getQueryString(name) {
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
    var r = window.location.search.substr(1).match(reg);
    if (r != null) return decodeURIComponent(r[2]);
    return "";
};