Javascript 运行 www.jshint.com 时未定义“警报”
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"alert" is not defined when running www.jshint.com
提问by Adam Zalcman
I fixed this by simply adding var alert;However, is this what I should be doing to get the pesky error message to go away? Here is the fix. Here is the fail on www.jshint.com.
我通过简单地添加解决了这个问题，var alert;但是，这是我应该做的才能让讨厌的错误消息消失吗？这是修复。这是www.jshint.com上的失败。
I'm trying to learn from the error it throws..not necessarily make them go away.
我试图从它抛出的错误中吸取教训......不一定会让它们消失。
(function () {
"use strict";
var alert; // added this in to fix
function initialize_page()
{
alert ("hi");
}
addEventListener('load', initialize_page);
})();
回答by Boris Brdari?
Instead of
代替
alert('message')
you should use
你应该使用
window.alert('message');
Because this method is defined in windowobject.
因为这个方法是在windowobject 中定义的。
This of course assumes you have browseroption set to truein your .jshintrc, so this way jshint will know window object is exposed.
这当然假设你在你的 中browser设置了选项，这样 jshint 就会知道 window 对象是公开的。true.jshintrc
"browser" : true, // Standard browser globals e.g. window, document.
*The same thing happens with confirm().
*同样的事情发生在confirm().
回答by Adam Zalcman
Thisdocumentation says the following about the browseroption:
本文档说明了有关该browser选项的以下内容：
This option defines globals exposed by modern browsers: all the way from good ol' document and navigator to the HTML5 FileReader and other new developments in the browser world. Note: this option doesn't expose variables like alert or console. See option devel for more information.
这个选项定义了现代浏览器公开的全局变量：从优秀的文档和导航器到 HTML5 FileReader 和浏览器世界中的其他新发展。注意：此选项不会公开警报或控制台等变量。有关更多信息，请参阅选项开发。
and the following about the develoption:
以及关于该devel选项的以下内容：
This option defines globals that are usually used for logging poor-man's debugging: console, alert, etc. It is usually a good idea to not to ship them in production because, for example, console.log breaks in legacy versions of Internet Explorer.
此选项定义了通常用于记录穷人调试的全局变量：控制台、警报等。通常最好不要在生产中发布它们，因为例如，console.log 在旧版 Internet Explorer 中会中断。
You have browserenabled and develdisabled. You can control these with checkboxes under "Assume" on the jshint original page. I also recommend heeding the warning in the documentation ;-)
您启用了浏览器并禁用了开发。您可以使用 jshint 原始页面上“假设”下的复选框来控制这些。我还建议注意文档中的警告；-)
回答by Joshua
Set "devel:true" in the Options. This enables things like Alert, console, etc.
在选项中设置“devel:true”。这可以启用警报、控制台等。
See documentation here: http://jshint.com/docs/options/
请参阅此处的文档：http: //jshint.com/docs/options/
回答by Aliaksandr Shpak
Use .jshintrcfile or CTRL + ,in VS Code, to edit options for jshint.
使用.jshintrcfile 或CTRL + ,在VS Code中编辑jshint 的选项。
in js alert(data.status); or window.alert(data.status);
在 js 警报（data.status）中；或 window.alert(data.status);
"window": true,
"alert": true
or best
或最好
"devel": true,
{
"esversion": 6,
"browser": true,
"undef": true,
"varstmt": true,
"forin": true,
"unused": true,
"funcscope": true,
"lastsemic": true,
"moz": true,
"jquery": true,
"module": true,
"devel": true,
"globals": {
"window": true,
"document": true,
"console": true,
"alert": true
}
}
}
回答by Bhargavi Gopalachar
function prod(arr) {
let largest = 0;
let secondLargest = 0;
const len = arr.length;
for (let i = 0; i < len; i++) {
if (arr[i] > largest) {
secondLargest = largest;
largest = arr[i];
}
else if (arr[i] < largest && arr[i] > second_largest) {
secondLargest = arr[i]
}
}
return largest * secondLargest;
}
console.log(prod([2, 4, 7, 8]));
回答by Drew Hawken
Instead of:
代替：
alert('message')
I use:
我用：
var alert = window['alert'];
回答by DrStrangeLove
try passing window object in :
尝试传递窗口对象：
(function (global) {
"use strict";
var alert; // added this in to fix
function initialize_page()
{
global.alert ("hi");
}
addEventListener('load', initialize_page);
})(window);
回答by designbykhalid
declare alert as variable and it will work without any settings:
将警报声明为变量，它无需任何设置即可工作：
for example:
例如：
var alert;
alert('hello world');
