这又是一个拖欠了很久的分享，很早就有朋友留言问评论打字炫彩、震动特效怎么实现的。这功能其实网上早就有人分享 N 遍了，有点搜索技巧和 DIY 能力的站长同学也早就实现了。这里还是继续分享一下我这边的一些改进，也许有朋友可以用得到。
简单的改进：
1、移动端关闭震动，移动端震动会显得很卡；
2、添加震动开关，方便不喜欢的朋友进行关闭，采用 Cookie 记忆同一个浏览器点击关闭一次即可。
Ps：没什么技术含量，略懂 JS 语法的朋友完全可以自己继续发挥。以下是简单的部署步骤（不限于 WordPress，标准 HTML 网页均可使用）：
1、将以下代码保存为 js 文件，比如 apm-min.js 上传到网站主题目录：
- (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__){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;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}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(){requestAnimationFrame(loop);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}}())}])});
比如最终得到的 JS 地址：https://www.domain.com/wp-content/themes/begin/js/apm-min.js 能够在浏览器正常访问即可。
2、WordPress 在主题的评论模板文件 comments.php 中引入如下代码（位置随意），其他网站程序可以集成到网页的页脚等位置：
- <!-- 这里的js改为第1步中的实际JS地址 -->
- <script src="//www.domain.com/wp-content/themes/begin/js/apm-min.js"></script>
- <script type="text/javascript">
- /* Cookie写入函数 */
- function SetCookie(sName, sValue,iExpireDays) {
- domain='www.domain.com'; /*这里改成网站的实际域名*/
- if (iExpireDays){
- var dExpire = new Date();
- dExpire.setTime(dExpire.getTime()+parseInt(iExpireDays*24*60*60*1000));
- document.cookie = sName + "=" + escape(sValue) + "; expires=" + dExpire.toGMTString()+ "; path=/;domain="+domain;
- }
- else{
- document.cookie = sName + "=" + escape(sValue)+ "; path=/;domain=zhangge.net";
- }
- }
- /* Cookie获取函数 */
- function GetCookie(sName) {
- var arr = document.cookie.match(new RegExp("(^| )"+sName+"=([^;]*)(;|$)"));
- if(arr != null){return unescape(arr[2])};
- return null;
- }
- var openshake = '打开震动';
- var closeshake = '关闭震动';
- POWERMODE.colorful = true; /* 彩色开关，改成false则关闭彩色显示 */
- /* 默认开启震动 */
- if (GetCookie('shakectrl') == 1 || GetCookie('shakectrl') == null ) {
- jQuery('.shakectrl').text(closeshake);
- POWERMODE.shake = true;
- } else {
- jQuery('.shakectrl').text(openshake);
- POWERMODE.shake = false;
- }
- /* 移动端不震动 */
- if(/iphone|ipod|ipad|Android|nokia|blackberry|webos|webmate|bada|lg|ucweb|skyfire|sony|ericsson|mot|samsung|sgh|lg|philips|panasonic|alcatel|lenovo|cldc|midp|wap|mobile/i.test(navigator.userAgent.toLowerCase()) || GetCookie('shakectrl') == 0){
- POWERMODE.shake = false;
- } else {
- POWERMODE.shake = true;
- }
- /* 震动点击开关功能 */
- jQuery(".shakectrl").click(function(){
- if ( jQuery('.shakectrl').html() == closeshake ) {
- jQuery('.shakectrl').text(openshake);
- SetCookie("shakectrl", 0, 365);
- POWERMODE.shake = false;
- } else {
- jQuery('.shakectrl').text(closeshake);
- SetCookie("shakectrl", 1, 365);
- POWERMODE.shake = true;
- }
- });
- /* 将特效绑定到input */
- document.body.addEventListener('input', POWERMODE);
- </script>
3、在想要出现震动开关的位置添加按钮代码：
- <a class="shakectrl" href="javascript:void(0);" title="打字震得难受？你可以自行控制~" style="color:red">关闭震动</a>
Ps：每个人网站风格不一样，这个按钮样式就不给 CSS 代码了，自行 DIY 修改吧。效果预览：在 张戈博客 留言即可看到效果。
之前很多朋友留言说震动太难受了，我只能说那么大个红色开关，你却视而不见？说明观察力有待提高啊！
