对象不支持此操作 - 突然之间

Question

我是运行 1.7.5 版，出于某些无法理解的原因，我突然遇到语法错误（none 我的样式表在工作后发生了变化）并且我以相同的方式包含 .js 文件):

Object doesn't support this action

我已将错误追溯到这个奇怪的片段（第 7880 行）：

new(less.Parser)(env).parse(data, function (e, root) {
    if (e) { return callback(e, null, null, sheet); }
    try {
        callback(e, root, data, sheet, webInfo, path);
    } catch (e) {
        callback(e, null, null, sheet);
    }
}, {modifyVars: modifyVars, globalVars: less.globalVars});

...在 loadStyleSheet 函数中。事实上，我不明白该语法，并在控制台尝试它，我收到相同的错误消息：

new(less.Parser) # fails
new(less.Parser)(env) # fails
typeof less.Parser # yields "function"

这是怎么回事？

description: "Object doesn't support this action" message: "Object doesn't support this action" number: -2146827843 stack: "TypeError: Object doesn't support this action\n at Parser (http://localhost:53109/Scripts/System/less-1.7.5.js:360:5)\n at Anonymous function (http://localhost:53109/Scripts/System/less-1.7.5.js:7880:13)\n at Anonymous function (http://localhost:53109/Scripts/System/less-1.7.5.js:7838:13)\n at handleResponse (http://localhost:53109/Scripts/System/less-1.7.5.js:7763:13)\n at doXHR (http://localhost:53109/Scripts/System/less-1.7.5.js:7783:9)\n
at loadFile (http://localhost:53109/Scripts/System/less-1.7.5.js:7832:5)\n at loadStyleSheet (http://localhost:53109/Scripts/System/less-1.7.5.js:7856:5)\n at loadStyleSheets (http://localhost:53109/Scripts/System/less-1.7.5.js:7896:9)\n at less.refresh (http://localhost:53109/Scripts/System/less-1.7.5.js:7973:5)\n at Anonymous function (http://localhost:53109/Scripts/System/less-1.7.5.js:7999:1)"

*更新我*

所以语法似乎没问题。我能做到：

new(function() {})('x')

所以考虑到 less.Parser 是一个代码应该工作的函数......但它没有。如果我查看 less.Parser:

，这就是我得到的

function Parser(env) {
    var input,       // LeSS input string
        i,           // current index in `input`
        j,           // current chunk
        saveStack = [],   // holds state for backtracking
        furthest,    // furthest index the par
    [Methods]: {...}
    __proto__: 
function() {
    [native code]
}

    arguments: null
    caller: null
    length: 1
    prototype: {...}

有什么不对劲吗？

*更新二*

意识到 1.7.5 远远落后于当前版本，我升级到 2.5.0（立即离开 CDN）但现在它在其他地方中断（第 2440 行）：

if (typeof Object.create === 'undefined') {
    var F = function () {};
    F.prototype = Error.prototype;
    LessError.prototype = new F();
} else {
    LessError.prototype = Object.create(Error.prototype); # breaks here
}

错误：

Object.create: argument is not an Object and is not null

如果我查看 Error.prototype，我会得到 undefined...grr...

Answer 1

经过一番哀嚎和咬牙切齿，我想通了。我的一个脚本正在设置：

var Error = {};

经验教训：小心你的变量名！如果编译器对此有所抱怨就好了。

对象不支持此操作 - 突然之间

Object doesn't support this action - all of a sudden

javascript

less