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技术 2022年11月19日
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在数据传输流程中,json是以文本,即字符串的形式传递的,而JS操作的是JSON对象,所以,JSON对象和JSON字符串之间的相互转换是关键。例如:

JSON字符串:

var str1 = ‘{ “name”: “cxh”, “sex”: “man” }’;

JSON对象:

var str2 = { “name”: “cxh”, “sex”: “man” };

下面说下今天遇到的问题,java后台传递参数到前台jsp中的js,一直无法取到,查找原因发现是 不该写双引号 “”

js代码写在了jsp当中,下面的代码是错误的代码,无法取到json数据,代码如下:

错误代码如下(千万不要这么写):

<script type="text/javascript">
var aa = "<%=request.getAttribute("testTypeJson")%>";
alert(aa);
</script>

取得json字符串的代码:

<script type="text/javascript">
var aa = '<%=request.getAttribute("testTypeJson")%>';
alert(aa);
</script>

运行截图:

aaarticlea/png;base64,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” alt=”” />

获得json对象的代码:

<script type="text/javascript">
var aa = <%=request.getAttribute("testTypeJson")%>;
alert(aa);
alert(aa.key1);
</script>

运行截图:

aaarticlea/png;base64,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” alt=”” />

aaarticlea/png;base64,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” alt=”” />

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