溢出时如何断字-javascript

Question

我输入了animation.js，但是我想在溢出时打断单词 请帮帮我 ............................................... ................................................... ................................................... ................................................... ......................................

function setupTypewriter(t) {
        var HTML = t.innerHTML;

        t.innerHTML = "";

        var cursorPosition = 0,
            tag = "",
            writingTag = false,
            tagOpen = false,
            typeSpeed = 100,
        tempTypeSpeed = 0;

        var type = function() {

            if (writingTag === true) {
                tag += HTML[cursorPosition];
            }

            if (HTML[cursorPosition] === "<") {
                tempTypeSpeed = 0;
                if (tagOpen) {
                    tagOpen = false;
                    writingTag = true;
                } else {
                    tag = "";
                    tagOpen = true;
                    writingTag = true;
                    tag += HTML[cursorPosition];
                }
            }
            if (!writingTag && tagOpen) {
                tag.innerHTML += HTML[cursorPosition];
            }
            if (!writingTag && !tagOpen) {
                if (HTML[cursorPosition] === " ") {
                    tempTypeSpeed = 0;
                }
                else {
                    tempTypeSpeed = (Math.random() * typeSpeed) + 50;
                }
                t.innerHTML += HTML[cursorPosition];
            }
            if (writingTag === true && HTML[cursorPosition] === ">") {
                tempTypeSpeed = (Math.random() * typeSpeed) + 50;
                writingTag = false;
                if (tagOpen) {
                    var newSpan = document.createElement("span");
                    t.appendChild(newSpan);
                    newSpan.innerHTML = tag;
                    tag = newSpan.firstChild;
                }
            }

            cursorPosition += 1;
            if (cursorPosition < HTML.length - 1) {
                setTimeout(type, tempTypeSpeed);
            }

        };

        return {
            type: type
        };
    }

    var typer = document.getElementById('typewriter');

    typewriter = setupTypewriter(typewriter);

    typewriter.type();