GM_addValueChangeListener实例

Question

我还没有在网上找到任何GM_addValueChangeListener的例子。我想为Chrome添加一个简单的监听器，查看是否设置了GM值。如果不是铬的话，我会设置一个间隔。

if (!!window.chrome && window.navigator.vendor === "Google Inc."){ 
    console.log("GM_addValueChangeListener supported.");
    GM_addValueChangeListener(name, update);
    function update(name, old_value, new_value, from_remote) {
       console.log(arguments);    
        if( getStorage() ) {  //gets GM stored data
            //update fields
            removeStorage(); //removes GM stored data
        } else alert("No data exported.");
    }
} else {
    console.log("not chrome, using setInterval");
    setInterval(function(){ 
        if( getStorage() ) {  //gets GM stored data
            //update fields
            removeStorage(); //removes GM stored data
        } else console.log("no data yet...")
    }, 2000);
}

Answer 1

// ==UserScript==
// @name         Test GM_addValueChangeListener
// @grant        GM_addValueChangeListener
// @grant        GM_setValue
// ==/UserScript==

GM_addValueChangeListener("abc", function() { console.log(arguments) });
GM_setValue("abc",123);