相关疑难解决方法(0)

我希望JavaScript函数具有可选参数,我将其设置为默认值,如果未定义该值,则使用该参数.在Ruby中你可以这样做:

def read_file(file, delete_after = false)
  # code
end

这是否适用于JavaScript？

function read_file(file, delete_after = false) {
  // Code
}

我试图使用gulp来缩小包含JS文件的文件夹.但是,其中一个文件存在上述错误,导致其无法缩小.

我设法抓住并打印了错误,我在这里部分打印过:

JS_Parse_Error {
 message: 'SyntaxError: Unexpected token: punc ())',
 filename: 'ex.js',
 line: 189,
 col: 25,
 pos: 6482,
 stack: Error\n    at new JS_Parse_Error (eval at <anonymous> ... ) 
 plugin: 'gulp-uglify',
 fileName: '.../js/ex.js',
 showStack: false
}

有问题的文件包含以下内容,缩写为:

function() {
  ...
  $.confirm({
    buttons: {
        confirm: function() {
            $.post('/ajax-handler', {
                    ...
                })
                .done( function(response) {
                    var data = filterResponse(response);
                    if (data['status'] == 'success') {
                        sleep(1000).then(() => {
                    *       ...
                        });
                        sleep(5000).then(() => {
                            ...  
                        });

                    } else {
                        console.log('Oops!');
                    }
                })
                .fail( function(err, …

我正在尝试将我的资产预编译用于生产,但rails似乎没有合作.

$ bundle exec rake assets:precompile
/home/drderp/.rvm/rubies/ruby-1.9.3-p194/bin/ruby /home/drderp/.rvm/gems/ruby-1.9.3-p194@global/bin/rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets
rake aborted!
Unexpected token punc, expected punc (line: 213, col: 13, pos: 5986)

Error
    at new JS_Parse_Error (<eval>:1720:22)
    at js_error (<eval>:1728:15)
    at croak (<eval>:2189:17)
    at token_error (<eval>:2196:17)
    at expect_token (<eval>:2209:17)
    at Object.expect (<eval>:2212:40)
    at Object.1 (<eval>:2763:38)
    at prog1 (<eval>:2770:28)
    at <eval>:2560:51
    at maybe_unary (<eval>:2665:27)
  (in /home/drderp/projects/p/app/assets/javascripts/application.js)

Tasks: TOP => assets:precompile:primary
(See full trace by running task with --trace)
rake aborted!
Command failed with status (1): [/home/drderp/.rvm/rubies/ruby-1.9.3-p194/b...]

Tasks: TOP => …

RAILS_ENV=production rake assets:precompile --trace
Digest::Digest is deprecated; use Digest
Digest::Digest is deprecated; use Digest
** Invoke assets:precompile (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
** Execute assets:precompile
rake aborted!
ExecJS::RuntimeError: SyntaxError: Unexpected token operator «=», expected punc «,» (line: 159, col: 25, pos: 5132)

Error
    at new JS_Parse_Error (/tmp/execjs20161124-23752-1wuk17bjs:3623:11948)
    at js_error (/tmp/execjs20161124-23752-1wuk17bjs:3623:12167)
    at croak (/tmp/execjs20161124-23752-1wuk17bjs:3623:22038)
    at token_error (/tmp/execjs20161124-23752-1wuk17bjs:3623:22175)
    at expect_token (/tmp/execjs20161124-23752-1wuk17bjs:3623:22411)
    at expect (/tmp/execjs20161124-23752-1wuk17bjs:3623:22562)
    at ctor.argnames (/tmp/execjs20161124-23752-1wuk17bjs:3623:27486)
    at function_ (/tmp/execjs20161124-23752-1wuk17bjs:3623:27550)
    at /tmp/execjs20161124-23752-1wuk17bjs:3623:24469 …