创建包含 JSON 语法的 JavaScript 字符串

var txt = '{ "sites" : [' +

  '{ "name":"蜜蜂教程" , "url":"www.mifengjc.com" },' +

  '{ "name":"google" , "url":"www.google.com" },' +

  '{ "name":"微博" , "url":"www.weibo.com" } ]}';