小编Sur*_*eja的帖子

var randomNumber = Math.floor(Math.random() * (10 - 1 + 1)) + 1;
var setOfNums = [1,2,5,10,50];
var additionEquation; //ex: for randomNumber = 28; additionEquation = 10+10+5+2+1;

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等式中元素的最大数量是5.是否可以在java脚本中使用？提前感谢.

html javascript random

Sur*_*eja

2017 09-19

5
推荐指数

1
解决办法

76
查看次数

window.focus() 和 window.blur() 有什么区别？

我是...的新学习者JavaScript，我无法找出window.focus();和之间的区别window.blur();。

<!DOCTYPE html>
<html>
<body>
<button onclick="focus()">Click</button>
<script>
 function focus() {
var myWindow = window.open("", "", "width=200,height=100");
myWindow.document.write("<p>A new window!</p>");
myWindow.focus();
}
</script>
</body>

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当我使用它们时，我找不到它们在窗口上的任何操作......

帮我找出它们的用途...:)

javascript

Sur*_*eja

2016 08-26

4
推荐指数

1
解决办法

1万
查看次数

No Access-Control-Allow-Origin error in Meteor app

I added CORS extension to chrome. When called ajax from localhost I got response in the form of XML. If I disabled CORS extension I got the following error. I referred so many questions in this community. But I cant't resolve my problem. It may duplicate but I'm asking this question for help with hope.

XMLHttpRequest cannot load https://buzz.machaao.com/feed. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin ' …

javascript http localhost cors meteor

Sur*_*eja

2019 06-22

3
推荐指数

1
解决办法

973
查看次数

为什么在我的helloworld程序中没有定义ReactDOM？

我是Reactjs的新学习者.我试图在浏览器中执行hello world程序.但是我收到了一个错误.即

react-dom.min.js:12未捕获的TypeError:无法读取未定义的属性'__SECRET_DOM_DO_NOT_USE_OR_YOU_WILL_BE_FIRED'

我的代码是

<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8" />
	<title>Hello React!</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.2/react-dom.min.js"></script> 
	<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.2/react.min.js"></script>
	<script src="https://unpkg.com/babel-core@5.8.38/browser.min.js"></script>
</head>
<body>
	<div id="example"></div>
	<script type="text/babel">
		ReactDOM.render(
		<h1>Hello, world!</h1>,
		document.getElementById('example')
		);
	</script>
</body>
</html>

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我无法理解这个问题.

html javascript reactjs

Sur*_*eja

lucky-day

2
推荐指数

1
解决办法

940
查看次数