求教在jquery2.1.4中的getJSON是怎么用的；下面的为什么不能执行

Question

$("#letter-b a").on("click",function(event){
    event.preventDefault();
    $.getJSON('test22_b.json',function(data){
        alert(1);
        var html = '';
        $.each(data,function(entryIndex,entry){
            html += '<div class="entry">';
            html += '<h3 class="term">' + entry.term + '</h3>';
            html += '<div class="part">' + entry.part + '</div>';
            html += '<div class="definition">';
            html += entry.definition;
            html += '</div>';
            html += '</div>';
        });
        $('#dictionary').html(html);
    });
});

Answer 1

 <script type="text/javascript">
$(document).ready(function(){
  var data= { one:{term:'a',part :'b',definition:'c' },two:{term:'aa',part :'bb',definition:'cc' }};     
$.each(data, function(entryIndex,entry) {     
    alert('term-->'+entry.term+'--part-->'+entry.part+'--definition-->'+entry.definition);           
});   
});
</script>