打字效果动画实现方法
方法一(纯css实现)：
html代码：
<h1 class="typing typing-item">打字动画打字动画打字动画</h1>
css样式：
.typing{ font-size: 1rem; padding-top: 6%; margin-bottom: 5%; font-weight: normal; letter-spacing: .3rem; -webkit-animation: type 2s steps(50, end) forwards; animation: type 2s steps(50, end) forwards; } .typing-item{ text-align: center; color: black; width:100%; white-space:nowrap; overflow:hidden; } @-webkit-keyframes type{ from { width: 0;} } @keyframes type{ from { width: 0;} }
缺点：只能实现一行式的打字效果，无法打出一段落文字
方法二（jquery）:
html代码：
<div class="text-container"> <span class="text-static"></span> <span class="text"></span> <span class="cursor">|</span> </div>
jquery代码：
<script type="text/javascript" src="../js/jquery.js"></script> <script> $(function() { myPrint(["hello my word!"], 100); function myPrint(arr, speed) { var index = 0; var str = arr[index]; var i = 0; var add = true; var mySetInterval = setInterval(function() { // 延时4个字符的时间 if (i == str.length + 4) { add = false; // 如果是最后一个字符串则终止循环函数 if (index + 1 >= arr.length) { clearInterval(mySetInterval); } } else if (i == -2) { // 删除后延时2个字符的时间 add = true; str = arr[++index]; } setTimeout(function() { if (add) { i++; $(".text").html(str.substring(0, i)); } else { $(".text").html(str.substring(0, i - 1)); i--; } }) }, speed) } }) </script>
方法三（jquery-typed插件）:
html代码：
<div class="content"> <div class="content-div"> <span id="content-item"></span> </div> </div> <input type="hidden" id="content" value="内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容" />
引入Typed.js，Typed.js内容如下
// The MIT License (MIT) // Typed.js | Copyright (c) 2014 Matt Boldt | www.mattboldt.com // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. ! function($) { "use strict"; var Typed = function(el, options) { // chosen element to manipulate text this.el = $(el); // options this.options = $.extend({}, $.fn.typed.defaults, options); // attribute to type into this.isInput = this.el.is('input'); this.attr = this.options.attr; // show cursor this.showCursor = this.isInput ? false : this.options.showCursor; // text content of element this.elContent = this.attr ? this.el.attr(this.attr) : this.el.text() // html or plain text this.contentType = this.options.contentType; // typing speed this.typeSpeed = this.options.typeSpeed; // add a delay before typing starts this.startDelay = this.options.startDelay; // backspacing speed this.backSpeed = this.options.backSpeed; // amount of time to wait before backspacing this.backDelay = this.options.backDelay; // input strings of text this.strings = this.options.strings; // character number position of current string this.strPos = 0; // current array position this.arrayPos = 0; // number to stop backspacing on. // default 0, can change depending on how many chars // you want to remove at the time this.stopNum = 0; // Looping logic this.loop = this.options.loop; this.loopCount = this.options.loopCount; this.curLoop = 0; // for stopping this.stop = false; // custom cursor this.cursorChar = this.options.cursorChar; // shuffle the strings this.shuffle = this.options.shuffle; // the order of strings this.sequence = []; // All systems go! this.build(); }; Typed.prototype = { constructor: Typed , init: function() { // begin the loop w/ first current string (global self.string) // current string will be passed as an argument each time after this var self = this; self.timeout = setTimeout(function() { for (var i=0;i<self.strings.length;++i) self.sequence[i]=i; // shuffle the array if true if(self.shuffle) self.sequence = self.shuffleArray(self.sequence); // Start typing self.typewrite(self.strings[self.sequence[self.arrayPos]], self.strPos); }, self.startDelay); } , build: function() { // Insert cursor if (this.showCursor === true) { this.cursor = $("<span class=\"typed-cursor\">" + this.cursorChar + "</span>"); this.el.after(this.cursor); } this.init(); } // pass current string state to each function, types 1 char per call , typewrite: function(curString, curStrPos) { // exit when stopped if (this.stop === true) { return; } // varying values for setTimeout during typing // can't be global since number changes each time loop is executed var humanize = Math.round(Math.random() * (100 - 30)) + this.typeSpeed; var self = this; // ------------- optional ------------- // // backpaces a certain string faster // ------------------------------------ // // if (self.arrayPos == 1){ // self.backDelay = 50; // } // else{ self.backDelay = 500; } // contain typing function in a timeout humanize'd delay self.timeout = setTimeout(function() { // check for an escape character before a pause value // format: \^\d+ .. eg: ^1000 .. should be able to print the ^ too using ^^ // single ^ are removed from string var charPause = 0; var substr = curString.substr(curStrPos); if (substr.charAt(0) === '^') { var skip = 1; // skip atleast 1 if (/^\^\d+/.test(substr)) { substr = /\d+/.exec(substr)[0]; skip += substr.length; charPause = parseInt(substr); } // strip out the escape character and pause value so they're not printed curString = curString.substring(0, curStrPos) + curString.substring(curStrPos + skip); } if (self.contentType === 'html') { // skip over html tags while typing var curChar = curString.substr(curStrPos).charAt(0) if (curChar === '<' || curChar === '&') { var tag = ''; var endTag = ''; if (curChar === '<') { endTag = '>' } else { endTag = ';' } while (curString.substr(curStrPos).charAt(0) !== endTag) { tag += curString.substr(curStrPos).charAt(0); curStrPos++; } curStrPos++; tag += endTag; } } // timeout for any pause after a character self.timeout = setTimeout(function() { if (curStrPos === curString.length) { // fires callback function self.options.onStringTyped(self.arrayPos); // is this the final string if (self.arrayPos === self.strings.length - 1) { // animation that occurs on the last typed string self.options.callback(); self.curLoop++; // quit if we wont loop back if (self.loop === false || self.curLoop === self.loopCount) return; } self.timeout = setTimeout(function() { self.backspace(curString, curStrPos); }, self.backDelay); } else { /* call before functions if applicable */ if (curStrPos === 0) self.options.preStringTyped(self.arrayPos); // start typing each new char into existing string // curString: arg, self.el.html: original text inside element var nextString = curString.substr(0, curStrPos + 1); if (self.attr) { self.el.attr(self.attr, nextString); } else { if (self.isInput) { self.el.val(nextString); } else if (self.contentType === 'html') { self.el.html(nextString); } else { self.el.text(nextString); } } // add characters one by one curStrPos++; // loop the function self.typewrite(curString, curStrPos); } // end of character pause }, charPause); // humanized value for typing }, humanize); } , backspace: function(curString, curStrPos) { // exit when stopped if (this.stop === true) { return; } // varying values for setTimeout during typing // can't be global since number changes each time loop is executed var humanize = Math.round(Math.random() * (100 - 30)) + this.backSpeed; var self = this; self.timeout = setTimeout(function() { // ----- this part is optional ----- // // check string array position // on the first string, only delete one word // the stopNum actually represents the amount of chars to // keep in the current string. In my case it's 14. // if (self.arrayPos == 1){ // self.stopNum = 14; // } //every other time, delete the whole typed string // else{ // self.stopNum = 0; // } if (self.contentType === 'html') { // skip over html tags while backspacing if (curString.substr(curStrPos).charAt(0) === '>') { var tag = ''; while (curString.substr(curStrPos).charAt(0) !== '<') { tag -= curString.substr(curStrPos).charAt(0); curStrPos--; } curStrPos--; tag += '<'; } } // ----- continue important stuff ----- // // replace text with base text + typed characters var nextString = curString.substr(0, curStrPos); if (self.attr) { self.el.attr(self.attr, nextString); } else { if (self.isInput) { self.el.val(nextString); } else if (self.contentType === 'html') { self.el.html(nextString); } else { self.el.text(nextString); } } // if the number (id of character in current string) is // less than the stop number, keep going if (curStrPos > self.stopNum) { // subtract characters one by one curStrPos--; // loop the function self.backspace(curString, curStrPos); } // if the stop number has been reached, increase // array position to next string else if (curStrPos <= self.stopNum) { self.arrayPos++; if (self.arrayPos === self.strings.length) { self.arrayPos = 0; // Shuffle sequence again if(self.shuffle) self.sequence = self.shuffleArray(self.sequence); self.init(); } else self.typewrite(self.strings[self.sequence[self.arrayPos]], curStrPos); } // humanized value for typing }, humanize); } /** * Shuffles the numbers in the given array. * @param {Array} array * @returns {Array} */ ,shuffleArray: function(array) { var tmp, current, top = array.length; if(top) while(--top) { current = Math.floor(Math.random() * (top + 1)); tmp = array[current]; array[current] = array[top]; array[top] = tmp; } return array; } // Start & Stop currently not working // , stop: function() { // var self = this; // self.stop = true; // clearInterval(self.timeout); // } // , start: function() { // var self = this; // if(self.stop === false) // return; // this.stop = false; // this.init(); // } // Reset and rebuild the element , reset: function() { var self = this; clearInterval(self.timeout); var id = this.el.attr('id'); this.el.after('<span id="' + id + '"/>') this.el.remove(); if (typeof this.cursor !== 'undefined') { this.cursor.remove(); } // Send the callback self.options.resetCallback(); } }; $.fn.typed = function(option) { return this.each(function() { var $this = $(this), data = $this.data('typed'), options = typeof option == 'object' && option; if (!data) $this.data('typed', (data = new Typed(this, options))); if (typeof option == 'string') data[option](); }); }; $.fn.typed.defaults = { strings: ["These are the default values...", "You know what you should do?", "Use your own!", "Have a great day!"], // typing speed typeSpeed: 0, // time before typing starts startDelay: 0, // backspacing speed backSpeed: 0, // shuffle the strings shuffle: false, // time before backspacing backDelay: 500, // loop loop: false, // false = infinite loopCount: false, // show cursor showCursor: true, // character for cursor cursorChar: "|", // attribute to type (null == text) attr: null, // either html or text contentType: 'html', // call when done callback function callback: function() {}, // starting callback function before each string preStringTyped: function() {}, //callback for every typed string onStringTyped: function() {}, // callback for reset resetCallback: function() {} }; }(window.jQuery);
调用Typed.js
var string = $('#content').val(); $('#content-item').typed({ strings: [" " + string], typeSpeed: 50, backDelay: 800, loop: false, loopCount: false });
方法四（纯js）：
html代码：
<div id="typing"></div>
js代码：
<script>
var str = '内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容内容';
var i = 0;
function typing(){
var divTyping = document.getElementById('typing');
if (i <= str.length) {
divTyping.innerHTML = str.slice(0, i++) + '_';
setTimeout('typing()', 200);
}
else{
divTyping.innerHTML = str;
}
}
typing();
</script>
最后，发现实现打字效果还是蛮简单的对吧，css的思路是利用width和overflow:hidden，动画让宽度变宽实现像打字的样式，但是样式有限，不能实现多行显示。js/jquery，普遍都是先得到字的内容，然后再逐字往容器中添加文字。问题不难，主要是要善于思考！！
