[英]how can i get the value of variable inside function to outside the on jquery
can i take the value from 'a = entry.username' out of the function?我可以从函数中取出'a = entry.username'的值吗? i want to get value that already looping inside the function我想获得已经在函数内部循环的值
$('#btnlogin').click(function(){
var usernamelogin = $('#usernamelogin').val()
var passwordlogin = $('#passwordlogin').val()
var data_user1 = JSON.parse(localStorage.getItem('data_user'))
for(var i in data_user1){
var entry = data_user1[i]
if(usernamelogin == entry.username && passwordlogin == entry.password){
window.location.href = "curhat.jsp"
a = entry.username
return
}
}
if(usernamelogin != entry.username && passwordlogin != entry.password){
alert("wrong username or password")
}
//console.log(data_user1)
//console.log('username = ' + entry.username)
})
Just declare a
before you enter the function so that you can use it later as shown below:只需在输入函数之前声明a
,以便以后可以使用它,如下所示:
let a;
$('#btnlogin').click(function(){
var usernamelogin = $('#usernamelogin').val()
var passwordlogin = $('#passwordlogin').val()
var data_user1 = JSON.parse(localStorage.getItem('data_user'))
for(var i in data_user1){
var entry = data_user1[i]
if(usernamelogin == entry.username && passwordlogin == entry.password){
window.location.href = "curhat.jsp"
a = entry.username
return
}
}
if(usernamelogin != entry.username && passwordlogin != entry.password){
alert("wrong username or password")
}
//console.log(data_user1)
//console.log('username = ' + entry.username)
})
//check if a is not null and do something with it
if(a){
//do something with a here out of the function
}
if you wish to pass a across pages, you may use localStorage or sessionStorage as shown below to store the value of a:如果您希望跨页面传递 a,您可以使用 localStorage 或 sessionStorage 如下所示来存储 a 的值:
a = entry.username;
localStorage.setItem("a",JSON.stringify(a))
and then later on retrieve it in another page using然后稍后使用在另一个页面中检索它
const val = JSON.parse(localStorage.getItem("a"))
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