$.each()遍历Json对象

1.遍历JavaScript数组对象：

var json = [ //中括号起始
    {"id":"1","tagName":"apple"},
    {"id":"2","tagName":"orange"},
    {"id":"3","tagName":"banana"}
];

$.each(json, function(index, obj) {
    alert(obj.tagName);
});

2.遍历Json对象：

var json = { //大括号起始
    {"id":"1","tagName":"apple"},
    {"id":"2","tagName":"orange"},
    {"id":"3","tagName":"banana"}
};

$.each(json, function(index, obj) {
    alert(obj['tagName']);
});

3.JSON字符串转换为JavaScript对象：

var json = '[{"id":"1","tagName":"apple"},{"id":"2","tagName":"orange"},
{"id":"3","tagName":"banana"},{"id":"4","tagName":"watermelon"},
{"id":"5","tagName":"pineapple"}]';

$.each(JSON.parse(json), function(idx, obj) {
    alert(obj.tagName);
});

//或者

$.each($.parseJSON(json), function(idx, obj) {
    alert(obj.tagName);
});