如何使用 JSLint 全局设置 'use strict'

Question

我是 javascript 的新手，正在尝试通过 JSLint 进行验证。我应该把 "use strict" 放在哪里全局使用它并验证？

这给我错误 "Unexpected expression 'use strict' in statement position.":

    "use strict";
    console.log('doing js in head-section');

    function helloWorld() {
        console.log('called function helloWorld()');
        alert('Hello World from a JS function showing an alert!');
    }

    function helloMyNumber() {
        console.log('called function helloMyNumber()');
        var max = 42;
        var yourLuckyNumber = prompt('Enter your lucky number (between 1 and '+ max +')');
        var myLuckyNumber = Math.floor(Math.random()*(max+1));
        var paragraph = document.getElementById('luckynumber');
        paragraph.innerHTML = paragraph.innerHTML + ' Your lucky number is: ' + yourLuckyNumber + '. Mine is: ' + myLuckyNumber + '. They ' + (yourLuckyNumber == myLuckyNumber ? 'DID ' : 'did NOT ') + 'match!';
    }



    console.log('doing JS in body-section');
    document.writeln('<p class="green">Hello World from JS within a body-section in HTML!</p>');

Answer 1

'use strict' 通常用在函数的开头。对于您的代码，我会将其全部包装在一个 IIFE 中，这将使 'use strict' 有效

(function() {
    "use strict";
    console.log('doing js in head-section');

    function helloWorld() {
        console.log('called function helloWorld()');
        alert('Hello World from a JS function showing an alert!');
    }

    function helloMyNumber() {
        console.log('called function helloMyNumber()');
        var max = 42;
        var yourLuckyNumber = prompt('Enter your lucky number (between 1 and '+ max +')');
        var myLuckyNumber = Math.floor(Math.random()*(max+1));
        var paragraph = document.getElementById('luckynumber');
        paragraph.innerHTML = paragraph.innerHTML + ' Your lucky number is: ' + yourLuckyNumber + '. Mine is: ' + myLuckyNumber + '. They ' + (yourLuckyNumber == myLuckyNumber ? 'DID ' : 'did NOT ') + 'match!';
    }



    console.log('doing JS in body-section');
    document.writeln('<p class="green">Hello World from JS within a body-section in HTML!</p>');
})();

Answer 2

根据 the documentation，JSLint 的 browser 选项自动禁用在全局级别使用 "use strict";。据我所知，没有办法重新打开它。

您可以关闭浏览器选项，并使用以下方式获得与 browser 选项相同的预声明全局变量：

/*global
Audio, clearInterval, clearTimeout, document, event, history, Image, location, name, navigator, Option, screen, setInterval, setTimeout, XMLHttpRequest
*/

或者，您可以将所有代码包装在一个 IIFE 中，并在其顶部使用 "use strict";。

或者您可以切换到 JSHint（有更多选项），并使用其 strict: global 选项在全局范围内允许 "use strict";。

如何使用 JSLint 全局设置 'use strict'

How to set 'use strict' globally with JSLint

javascript

jslint

use-strict