Javascript TRUE未定义或引号 [英] Javascript TRUE is not defined or in quotes

问题描述

我有一个包含

<car>
    <id>123</id>
    <sunroof>FALSE</sunroof>
    <service>TRUE</service>
</car>

以下代码仅在我在报价中包装TRUE时有效，例如（service = =TRUE）

The following code only works if I wrap TRUE inside quotes e.g (service == "TRUE")

var service = tis.find("service").text();

if(service === TRUE){
    var service_tag = '<a title="Service" href="">Service</a>'
} else {
    var service_tag = '';
}

推荐答案

没有引号javascript会尝试将 TRUE 解释为值/表达式。在javascript中本机定义的值 TRUE 没有值。有 true 但javascript区分大小写，所以它不会将 TRUE 绑定到 true 。

Without quotes javascript will try to interpret TRUE as a value / expression. There is no value TRUE natively defined in javascript. There is true but javascript is case sensitive so it won't bind TRUE to true.

从 text（）返回的值是字符串原始。写TRUE返回字符串 TRUE成功地与值服务进行比较

The value you get back from text() is a string primitive. Writing "TRUE" gives you back the string "TRUE" which does compare succesfully with the value service

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