监听dom元素属性变化，类似vue的watch，亲测

 var targetNode = $('#query')[0];
    function callback(mutationsList, observer) {
    console.log(13,mutationsList);
    console.log(14,observer);
    console.log(111111111);
    }
    
    var  options = {
        'childList': true,
        'attributes':true
        
    }
    var mutationObserver = new MutationObserver(callback);
    mutationObserver.observe(targetNode, options );