普通的ajax请求是无法跨域的!

如:

<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script>
function abc(){
$.post("http://localhost:8080/index/now","{}")
}
</script>
</head>
<body>
<button onclick="abc()">点</button>
</body>
</html>

会抛出一个异常:

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" alt="" />

根据提示,可以添加一个响应头来解决这个问题:

    @RequestMapping("now")
@ResponseBody
public String now(HttpServletResponse response) {
response.addHeader("Access-Control-Allow-Origin", "*");
return "这是一个测试"; }

就是给响应添加一个响应头就可以了

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iP3fQjW1titsvlQjoZV7JJWVaUeDKdtsvlAvNqaZVWXgIAgJvamctsHCflMDtrjklHYkrqhbb4QAiJKYrSSixycjmrxPQVj7gciavLI4pxRYV+ASOeTBe0L9XR1C5gfRkAhPKyuUy/mhaRZZ9x+YKlTWbDhPiO2H6h2CH+fJl+rUI/kfb2YMjlsN9HP+w7Ikn01WaVWFiWW3p7AABwSzv/3k+fC7Of7xXSST+zOpxS4j7jAU2+YNs/FWGXoVOKQpeS2eWUlKJYK5rm9QAAXYe/wwYAEAtyGQBALMhlAACxIJcBAMSCXAYAEAtyGQBALMhlAACxIJcBAMSCXAYAEAtyGQBALE5zGQAAOsNRLgMAQMcglwEAxIJcBgAQC3IZAEAsyGUAALEglwEAxIJcBgAQC3IZAEAsyGUAALEglwEAxIJcBgAQC3IZAEAsyGUAALEglwEAxIJcBgAQC3IZAEAsyGUAALEglwEAxIJcBgAQC3IZAEAsyGUAALEglwEAxIJcBgAQC3IZAEAsyGUAALEglwEAxIJcBgAQC3IZAEAsyGUAALEglwEAxIJcBgAQC3IZAEAsyGUAALH8D48AvnXCQgRRAAAAAElFTkSuQmCC" 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