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Detecting an undefined object property
What's the best way of checking if an object property in JavaScript is undefined?
46 Answers
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How to find first element of array matching a boolean condition in JavaScript?
...is is probably used, it is a small list to begin with, and the majority of JavaScript applications are not complicated enough to really worry about efficiency at this level. [].filter(test).pop() or [].filter(test)[0] are simple, native and readable. Of-course I am talking about businessy apps or we...
form serialize javascript (no framework)
Wondering is there a function in javascript without jquery or any framework that allows me to serialize the form and access the serialized version?
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What is the best way to add options to a select from a JavaScript object with jQuery?
What is the best method for adding options to a <select> from a JavaScript object using jQuery?
36 Answers
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How to design a multi-user ajax web application to be concurrently safe
...ficiently. Observer-Pattern is your friend for this.
2. Client-Side:
A javascript client that is able to have a long-running HTTP-Connection to said server above, or uses lightweight polling.
A javascript artifact-updater component that refreshes the sites content when the connected javascript c...
Convert a negative number to a positive one in JavaScript
Is there a math function in JavaScript that converts numbers to positive value?
16 Answers
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Difference between JSON.stringify and JSON.parse
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JSON.stringify turns a JavaScript object into JSON text and stores that JSON text in a string, eg:
var my_object = { key_1: "some text", key_2: true, key_3: 5 };
var object_as_string = JSON.stringify(my_object);
// "{"key_1":"some text","key_2"...
Extending an Object in Javascript
I am currently transforming from Java to Javascript, and it's a bit hard for me to figure out how to extend objects the way I want it to do.
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Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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print(sum)
until sum >1000
函数
Lua的函数和Javascript的很像
递归
1
2
3
4
function fib(n)
if n < 2 then return 1 end
return fib(n - 2) + fib(n - 1)
end
闭包
同样，Javascript附体！
示...
pass string parameter in an onclick function
... name='gotoNode'
data-arg1='1234'>GotoNode</button>
On javascript layer:
invoke = (event) => {
let nameOfFunction = this[event.target.name];
let arg1 = event.target.getAttribute('data-arg1');
//We can add more args as needed...
window[nameOfFunction](arg1)
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