Window.prompt()

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句法
范例
注意事项
规范
浏览器兼容性
另请参阅
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Window.prompt() displays a dialog with an optional message prompting the user to input some text.

句法

result = window.prompt(message, default);

参数

message 可选
default 可选: A string containing the default value displayed in the text input field. Note that in Internet Explorer 7 and 8, if you do not provide this parameter, the string "undefined" is the default value.

返回值

A string containing the text entered by the user, or null .

范例

let sign = prompt("What's your sign?");
if (sign.toLowerCase() == "scorpio") {
  alert("Wow! I'm a Scorpio too!");
}
// there are many ways to use the prompt feature
sign = window.prompt(); // open the blank prompt window
sign = prompt();       //  open the blank prompt window
sign = window.prompt('Are you feeling lucky'); // open the window with Text "Are you feeling lucky"
sign = window.prompt('Are you feeling lucky', 'sure'); // open the window with Text "Are you feeling lucky" and default value "sure"

When the user clicks the OK button, text entered in the input field is returned. If the user clicks OK without entering any text, an empty string is returned. If the user clicks the Cancel button, this function returns null .

The above prompt appears as follows (in Chrome on OS X):

注意事项

A prompt dialog contains a single-line textbox, a Cancel button, and an OK button, and returns the (possibly empty) text the user entered into that textbox.

The following text is shared between this article, DOM:window.confirm and DOM:window.alert Dialog boxes are modal windows; they prevent the user from accessing the rest of the program's interface until the dialog box is closed. For this reason, you should not overuse any function that creates a dialog box (or modal window).

Please note that result is a string. That means you should sometimes cast the value given by the user. For example, if their answer should be a Number, you should cast the value to Number.

const aNumber = Number(window.prompt("Type a number", ""));

规范

规范	状态	注释
HTML 实时标准 The definition of 'prompt()' in that specification.	实时标准

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`prompt`	Chrome 1 1 Starting with Chrome 46, this method is blocked inside an `<iframe>` unless its sandbox attribute has the value `allow-modals` .	Edge 12	Firefox 1	IE 4 4 This function has no effect in the Modern UI/Metro version of Internet Explorer for Windows 8. It does not display a prompt to the user, and always returns `undefined` . It is not clear whether this is a bug or intended behavior. Desktop versions of IE do implement this function.	Opera 3 3 Starting with Opera 33, this method is blocked inside an `<iframe>` unless its sandbox attribute has the value `allow-modals` .	Safari 1	WebView Android 1 1 Starting with WebView 46, this method is blocked inside an `<iframe>` unless its sandbox attribute has the value `allow-modals` .	Chrome Android 18 18 Starting with Chrome 46, this method is blocked inside an `<iframe>` unless its sandbox attribute has the value `allow-modals` .	Firefox Android 4	Opera Android 10.1 10.1 Starting with Opera 33, this method is blocked inside an `<iframe>` unless its sandbox attribute has the value `allow-modals` .	Safari iOS 1	Samsung Internet Android 1.0 1.0 Starting with Samsung Internet 5.0, this method is blocked inside an `<iframe>` unless its sandbox attribute has the value `allow-modals` .

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句法

参数

返回值

范例

注意事项

规范

浏览器兼容性

图例

另请参阅

元数据

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