查看一個(gè)簡(jiǎn)單的jQuery的例子來遍歷一個(gè)JavaScript數(shù)組對(duì)象。
var json = [{"id":"1","tagName":"apple"},{"id":"2","tagName":"orange"},{"id":"3","tagName":"banana"},{"id":"4","tagName":"watermelon"},{"id":"5","tagName":"pineapple"}];$.each(json, function(idx, obj) {alert(obj.tagName);});上面的代碼片斷工作正常，提示 “apple”, “orange” … 等，如預(yù)期一樣。
問題: JSON 字符串
下面的例子中，聲明了一個(gè)JSON字符串（隨附單或雙引號(hào)）直接地。
var json = '[{"id":"1","tagName":"apple"},{"id":"2","tagName":"orange"},{"id":"3","tagName":"banana"},{"id":"4","tagName":"watermelon"},{"id":"5","tagName":"pineapple"}]';$.each(json, function(idx, obj) {alert(obj.tagName);});在Chrome中，它顯示在控制臺(tái)下面的錯(cuò)誤：
Uncaught TypeError: Cannot use 'in' operator to search for '156'
in [{"id":"1","tagName":"apple"}...
解決方案：JSON字符串轉(zhuǎn)換為JavaScript對(duì)象。
要修復(fù)它，通過標(biāo)準(zhǔn)JSON.parse()或jQuery 的 $.parseJSON 將其轉(zhuǎn)換為JavaScript對(duì)象。
var json = '[{"id":"1","tagName":"apple"},{"id":"2","tagName":"orange"},{"id":"3","tagName":"banana"},{"id":"4","tagName":"watermelon"},{"id":"5","tagName":"pineapple"}]';$.each(JSON.parse(json), function(idx, obj) {alert(obj.tagName);});//or $.each($.parseJSON(json), function(idx, obj) {alert(obj.tagName);});新聞熱點(diǎn)
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