大约有 1,992 项符合查询结果（耗时：0.0101秒） [XML]
“var” or no “var” in JavaScript's “for-in” loop?
... following.
function f (){
for (i=0; i<5; i++);
}
var i = 2;
f ();
alert (i); //i == 5. i should be 2
If you write var i in the for loop the alert shows 2.
JavaScript Scoping and Hoisting
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jQuery - hashchange event
.../window.onhashchange
cite as follow:
if ("onhashchange" in window) {
alert("The browser supports the hashchange event!");
}
function locationHashChanged() {
if (location.hash === "#somecoolfeature") {
somecoolfeature();
}
}
window.onhashchange = locationHashChanged;
...
How to show a dialog to confirm that the user wishes to exit an Android Activity?
....0+ this would look like:
@Override
public void onBackPressed() {
new AlertDialog.Builder(this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Closing Activity")
.setMessage("Are you sure you want to close this activity?")
.setPositiveButton("Yes", new D...
JavaScript closures vs. anonymous functions
...ssage = "This is the control. You should be able to see this message being alerted.";
regularFunction();
function regularFunction() {
alert(eval("message"));
}
}
We know that both lexicalScope and regularFunction aren't closures from the above definition.
When we...
jQuery: more than one handler for same event
...nts in sequence, e.g.:
$('#target')
.bind('click',function(event) {
alert('Hello!');
})
.bind('click',function(event) {
alert('Hello again!');
})
.bind('click',function(event) {
alert('Hello yet again!');
});
I guess the below code is doing the same
$('#target')
.cl...
Creating a system overlay window (always on top)
...our manifest:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
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Javascript Confirm popup Yes, No button instead of OK and Cancel
...
you can use sweetalert.
import into your HTML:
<script src="https://cdn.jsdelivr.net/npm/sweetalert2@8"></script>
and to fire the alert:
Swal.fire({
title: 'Do you want to do this?',
text: "You won't be able to revert thi...
How do I catch an Ajax query post error?
... data: "name=John&location=Boston",
success: function(msg){
alert( "Data Saved: " + msg );
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert("some error");
}
});
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How to create an object property from a variable value in JavaScript? [duplicate]
...ike so:
var myObj = new Object;
var a = 'string1';
myObj[a] = 'whatever';
alert(myObj.string1)
(alerts "whatever")
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jQuery AJAX cross domain
...ion(json){
// do stuff with json (in this case an array)
alert("Success");
},
error:function(){
alert("Error");
}
});
PHP:
<?php
$arr = array("element1","element2",array("element31","element32"));
$arr['name'] = "response";
echo $_GET['callback']...