Typecho评论打字的时候出现炫酷打字跳动闪动效果

ssr

撰写于 2022年 02月 26 日

老蒋这几天在比较专注Typecho CMS的一些文档，看到有些朋友用的Typecho搭建的个人博客还是非常不错的，有些酷炫的效果感觉我也要去使用的。比如我们在他们的博客评论留言打字的时候，有跳动酷炫的打字效果，这个是如何加进去的？
看到介绍是需要在网站底部body结束位置加上一段JS。

主要就是这个JS脚本。

(function webpackUniversalModuleDefinition(root, factory) {
if (typeof exports === 'object' && typeof module === 'object') module.exports = factory();
else if (typeof define === 'function' && define.amd) define([], factory);
else if (typeof exports === 'object') exports["POWERMODE"] = factory();
else root["POWERMODE"] = factory()
})(this, function() {
return (function(modules) {
    var installedModules = {};
    function __webpack_require__(moduleId) {
        if (installedModules[moduleId]) return installedModules[moduleId].exports;
        var module = installedModules[moduleId] = {
            exports: {},
            id: moduleId,
            loaded: false
        };
        modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
        module.loaded = true;
        return module.exports
    }
    __webpack_require__.m = modules;
    __webpack_require__.c = installedModules;
    __webpack_require__.p = "";
    return __webpack_require__(0)
})([function(module, exports, __webpack_require__) {
        'use strict';
        var canvas = document.createElement('canvas');
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;
        canvas.style.cssText = 'position:fixed;top:0;left:0;pointer-events:none;z-index:999999';
        window.addEventListener('resize', function() {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight
        });
        document.body.appendChild(canvas);
        var context = canvas.getContext('2d');
        var particles = [];
        var particlePointer = 0;
        var frames = 120;
        var framesRemain = frames;
        var rendering = false;
        POWERMODE.shake = true;

        function getRandom(min, max) {
            return Math.random() * (max - min) + min
        }
        function getColor(el) {
            if (POWERMODE.colorful) {
                var u = getRandom(0, 360);
                return 'hsla(' + getRandom(u - 10, u + 10) + ', 100%, ' + getRandom(50, 80) + '%, ' + 1 + ')'
            } else {
                return window.getComputedStyle(el).color
            }
        }
        function getCaret() {
            var el = document.activeElement;
            var bcr;
            if (el.tagName === 'TEXTAREA' || (el.tagName === 'INPUT' && el.getAttribute('type') === 'text')) {
                var offset = __webpack_require__(1)(el, el.selectionStart);
                bcr = el.getBoundingClientRect();
                return {
                    x: offset.left + bcr.left,
                    y: offset.top + bcr.top,
                    color: getColor(el)
                }
            }
            var selection = window.getSelection();
            if (selection.rangeCount) {
                var range = selection.getRangeAt(0);
                var startNode = range.startContainer;
                if (startNode.nodeType === document.TEXT_NODE) {
                    startNode = startNode.parentNode
                }
                bcr = range.getBoundingClientRect();
                return {
                    x: bcr.left,
                    y: bcr.top,
                    color: getColor(startNode)
                }
            }
            return {
                x: 0,
                y: 0,
                color: 'transparent'
            }
        }
        function createParticle(x, y, color) {
            return {
                x: x,
                y: y,
                alpha: 1,
                color: color,
                velocity: {
                    x: -1 + Math.random() * 2,
                    y: -3.5 + Math.random() * 2
                }
            }
        }
        function POWERMODE() {
            {
                var caret = getCaret();
                var numParticles = 5 + Math.round(Math.random() * 10);
                while (numParticles--) {
                    particles[particlePointer] = createParticle(caret.x, caret.y, caret.color);
                    particlePointer = (particlePointer + 1) % 500
                }
                framesRemain = frames;
                if (!rendering) {
                    requestAnimationFrame(loop)
                }
            } {
                if (POWERMODE.shake) {
                    var intensity = 1 + 2 * Math.random();
                    var x = intensity * (Math.random() > 0.5 ? -1 : 1);
                    var y = intensity * (Math.random() > 0.5 ? -1 : 1);
                    document.body.style.marginLeft = x + 'px';
                    document.body.style.marginTop = y + 'px';
                    setTimeout(function() {
                        document.body.style.marginLeft = '';
                        document.body.style.marginTop = ''
                    }, 75)
                }
            }
        };
        POWERMODE.colorful = false;

        function loop() {
            if (framesRemain > 0) {
                requestAnimationFrame(loop);
                framesRemain--;
                rendering = true
            } else {
                rendering = false
            }
            context.clearRect(0, 0, canvas.width, canvas.height);
            for (var i = 0; i < particles.length; ++i) {
                var particle = particles[i];
                if (particle.alpha <= 0.1) continue;
                particle.velocity.y += 0.075;
                particle.x += particle.velocity.x;
                particle.y += particle.velocity.y;
                particle.alpha *= 0.96;
                context.globalAlpha = particle.alpha;
                context.fillStyle = particle.color;
                context.fillRect(Math.round(particle.x - 1.5), Math.round(particle.y - 1.5), 3, 3)
            }
        }
        requestAnimationFrame(loop);
        module.exports = POWERMODE
    }, function(module, exports) {
        (function() {
            var properties = ['direction', 'boxSizing', 'width', 'height',
                'overflowX', 'overflowY', 'borderTopWidth', 'borderRightWidth',
                'borderBottomWidth', 'borderLeftWidth', 'borderStyle', 'paddingTop',
                'paddingRight', 'paddingBottom', 'paddingLeft', 'fontStyle',
                'fontVariant', 'fontWeight', 'fontStretch', 'fontSize',
                'fontSizeAdjust', 'lineHeight', 'fontFamily', 'textAlign',
                'textTransform', 'textIndent', 'textDecoration', 'letterSpacing',
                'wordSpacing', 'tabSize', 'MozTabSize'];
            var isFirefox = window.mozInnerScreenX != null;

            function getCaretCoordinates(element, position, options) {
                var debug = options && options.debug || false;
                if (debug) {
                    var el = document.querySelector('#input-textarea-caret-position-mirror-div');
                    if (el) {
                        el.parentNode.removeChild(el)
                    }
                }
                var div = document.createElement('div');
                div.id = 'input-textarea-caret-position-mirror-div';
                document.body.appendChild(div);
                var style = div.style;
                var computed = window.getComputedStyle ? getComputedStyle(element) : element.currentStyle;
                style.whiteSpace = 'pre-wrap';
                if (element.nodeName !== 'INPUT') style.wordWrap = 'break-word';
                style.position = 'absolute';
                if (!debug) style.visibility = 'hidden';
                properties.forEach(function(prop) {
                    style[prop] = computed[prop]
                });
                if (isFirefox) {
                    if (element.scrollHeight > parseInt(computed.height)) style.overflowY = 'scroll'
                } else {
                    style.overflow = 'hidden'
                }
                div.textContent = element.value.substring(0, position);
                if (element.nodeName === 'INPUT') div.textContent = div.textContent.replace(/\s/g, "\u00a0");
                var span = document.createElement('span');
                span.textContent = element.value.substring(position) || '.';
                div.appendChild(span);
                var coordinates = {
                    top: span.offsetTop + parseInt(computed['borderTopWidth']),
                    left: span.offsetLeft + parseInt(computed['borderLeftWidth'])
                };
                if (debug) {
                    span.style.backgroundColor = '#aaa'
                } else {
                    document.body.removeChild(div)
                }
                return coordinates
            }
            if (typeof module != "undefined" && typeof module.exports != "undefined") {
                module.exports = getCaretCoordinates
            } else {
                window.getCaretCoordinates = getCaretCoordinates
            }
        }())
    }
])
});
POWERMODE.colorful = true;  // make power mode colorful
POWERMODE.shake = false;    // turn off shake
document.body.addEventListener('input', POWERMODE);

我们可以保存为commentTyping.js，然后引用。