大约有 20,000 项符合查询结果（耗时：0.0301秒） [XML]
How do I check if an object has a specific property in JavaScript?
...ty] !== undefined;
};
x = {'key': 1};
if (x.hasOwnProperty('key')) {
alert('have key!');
}
if (!x.hasOwnProperty('bar')) {
alert('no bar!');
}
A safer, but slower solution, as pointed out by Konrad Rudolph and Armin Ronacher would be:
Object.prototype.hasOwnProperty = function(property...
Do something if screen width is less than 960 px
... screen width is less than 960 pixels? The code below always fires the 2nd alert, regardless of my window size:
10 Answers...
Using JQuery to check if no radio button in a group has been checked
...
if (!$("input[name='html_elements']:checked").val()) {
alert('Nothing is checked!');
}
else {
alert('One of the radio buttons is checked!');
}
share
|
improve this answer
...
Base64Util 拓展：支持图像框、画布、文件、文本字符串、图像精灵base64编...
...
注意事项
下面提到的base64文本都是去掉了类似 “data:image/png;base64,” 前缀的文本。
图像框有关
画布有关
根据base64设置画布背景，已经有专门的内置属性块了。
...
How to find the array index with a value?
...ar index = functiontofindIndexByKeyValue(studentsArray, "name", "tanmay");
alert(index);
share
|
improve this answer
|
follow
|
...
JavaScript equivalent of PHP’s die
...n simply use the return; example
$(document).ready(function () {
alert(1);
return;
alert(2);
alert(3);
alert(4);
});
The return will return to the main caller function test1(); and continue from there to test3();
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTM...
How to find the size of localStorage
...ixed(2)+ " MB");}else{log.unshift("Total = " + total.toFixed(2)+ " KB");}; alert(log.join("\n"));
P.S. Snippets are updated according to request in the comment. Now the calculation includes the length of the key itself.
Each length is multiplied by 2 because the char in javascript stores as UTF-16...
Difference between .on('click') vs .click()
...ew</button>
<div id="container">
<button class="alert">alert!</button>
</div>
</html>
where we add new buttons via
$("button#add").click(function() {
var html = "<button class='alert'>Alert!</button>";
$("button.alert:last")....
AngularJS access scope from outside js function
...angularjs like a jquery/javascript event handler.
function change() {
alert("a");
var scope = angular.element($("#outer")).scope();
scope.$apply(function(){
scope.msg = 'Superhero';
})
}
Demo: Fiddle
...
Convert XML to JSON (and back) using Javascript
...</MyOperation>"; var jsonObj = X2JS.xml_str2json( xmlText ); alert (jsonObj.MyOperation.test); alert (jsonObj.MyOperation.test_asArray[0]);
– abdolence
Jul 25 '13 at 16:45
...