如何使用JSOM在根站点集合上设置属性包中的属性？

<script src="/_layouts/15/init.js"></script>
<script src="/_layouts/15/MicrosoftAjax.js"></script>
<script src="/_layouts/15/sp.runtime.js"></script>
<script src="/_layouts/15/sp.js"></script>

var context = new SP.ClientContext.get_current();

var web = context.get_site().get_rootWeb();
var allProperties = web.get_allProperties();

allProperties.set_item("属性名称", "属性值");

context.load(allProperties);
context.executeQueryAsync(onSuccess, onFailure);

<script src="/_layouts/15/init.js"></script>
<script src="/_layouts/15/MicrosoftAjax.js"></script>
<script src="/_layouts/15/sp.runtime.js"></script>
<script src="/_layouts/15/sp.js"></script>

<script>
    SP.SOD.executeFunc('sp.js', 'SP.ClientContext', function () {
        var context = new SP.ClientContext.get_current();
        var web = context.get_site().get_rootWeb();
        var allProperties = web.get_allProperties();

        allProperties.set_item("属性名称", "属性值");

        context.load(allProperties);
        context.executeQueryAsync(onSuccess, onFailure);
    });

    function onSuccess() {
        console.log("属性设置成功");
    }

    function onFailure(sender, args) {
        console.log("属性设置失败：" + args.get_message());
    }
</script>