[英]How to use the return true/false in js
I have a function, for example check navigator params, like that : 我有一个函数,例如check navigator params,就像这样:
function paramsDevice() {
if ( navigator.userAgent. etc ... ) {
return true;
} else {
return false;
}
}
how to use the return, in a other part of js code ? 如何在js代码的其他部分使用return?
if (paramsDevice == false)
not working and i have no error 不工作,我没有错误
In your code you are comparing undefined variable paramsDevice
with the boolean false
.To compare returned by paramsDevice()
value try the following : 在您的代码中,您将未定义的变量
paramsDevice
与布尔值false
进行比较。要比较paramsDevice()
返回的值,请尝试以下操作:
if (paramsDevice() == false)
You can also assign a variable to the result to use it in the if
statement : 您还可以将结果赋给结果以在
if
语句中使用它:
var paramsDevice = paramsDevice()
if (paramsDevice == false)
use ===
to compare with false
.You can assign your function a variable.Then you can check the variable if (paramsDevice == false)
使用
===
与false
进行比较。你可以为你的函数if (paramsDevice == false)
一个变量。然后你可以检查变量if (paramsDevice == false)
var paramsDevice = function() {
if (1 === true) {
return true;
} else {
return false;
}
};
if (paramsDevice === false) {
alert('working....');
}
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