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$.each遍历json对象

查看一个简单的jQuery的例子来遍历一个JavaScript数组对象。

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var json = [    {"id":"1","tagName":"apple"},    {"id":"2","tagName":"orange"},    {"id":"3","tagName":"banana"},    {"id":"4","tagName":"watermelon"},    {"id":"5","tagName":"pineapple"}]; $.each(json, function(idx, obj) {    alert(obj.tagName);});
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上面的代码片断工作正常,提示 “apple”, “orange” … 等,如预期一样。

问题: JSON 字符串

下面的例子中,声明了一个JSON字符串(随附单或双引号)直接地。

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var json = ‘[{"id":"1","tagName":"apple"},{"id":"2","tagName":"orange"},{"id":"3","tagName":"banana"},{"id":"4","tagName":"watermelon"},{"id":"5","tagName":"pineapple"}]‘; $.each(json, function(idx, obj) {    alert(obj.tagName);});
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在Chrome中,它显示在控制台下面的错误:

Uncaught TypeError: Cannot use ‘in‘ operator to search for ‘156‘ in [{"id":"1","tagName":"apple"}...

解决方案:JSON字符串转换为JavaScript对象。
要修复它,通过标准JSON.parse()或jQuery 的 $.parseJSON 将其转换为JavaScript对象。

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