编译器喜欢指出Javascript的错误

Question

I am somewhat of a beginner with JS but it occured to me that it would be nice to have a compiler like thingy that shows where the errors are (though its an interpreted language) - i am currently using Webstorm without any customizations but as far as i can tell its not pointing to obvious errors. For example if i have an opening brace and not a closing brace; or an extra closing brace - a compiler would point to that fact; i am sure JS has some eqivalent way - isnt there?

  <script>
        var switchDirection = false;

        function doAnimation(){
            var divAdvert = document.getElementById("divAdvert");
            var currentLeft = divAdvert.offsetLeft;
            var newLocation;

            if(!switchDirection) {
                newLocation = currentLeft + 2;

                if (currentLeft >= 400) {
                    switchDirection = true;
                }
            }else{
                    newLocation = currentLeft -2;

                    if(currentleft <=0){
                        switchDirection = false;
                    }
            }
                divAdvert.style.left = newLocation + "px";
        }
        }  // extra closing brace hard to find; why isnt there a compiler like thing to show where errors are for JS?

Answer 1

Here are some of your options:

• NodeJS; it's basically JavaScript for servers (rather than webpages), and can be run in a CLI environment, which will show you errors.
• The browser console will spit out errors in your code when you try to run in.
• Linters such as JSHint and JSLint will point out problems similar to browser consoles, and will also give you code style tips.
• IDE plugins. I'm sure if an IDE doesn't come out of the box with support for things like this, you can find a plugin for it (try looking for an automatic linter plugin).