JSON数据转换问题

Question

var json = [    {"id":"1","tagName":"apple"},    {"id":"2","tagName":"orange"},    {"id":"3","tagName":"banana"},    {"id":"4","tagName":"watermelon"},    {"id":"5","tagName":"pineapple"}];上面这段代码怎么转换为数组,id = [1,2,3,4,5]tagName = ["apple","orange","banana","watermelon","pineapple"]