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  • 默认头像方法-使用用户名称第一个字符作为默认头像

    1 function(e,t){function n(n,i){n=n||"",i=i||60;var o,a,r,s,c,l,u=["#1abc9c","#2ecc71","#3498db","#9b59b6","#34495e","#16a085","#27ae60","#2980b9","#8e44ad","#2c3e50","#f1c40f","#e67e22","#e74c3c","#eca0f1","#95a5a6","#f39c12","#d35400","#c0392b","#bdc3c7","#7f8c8d"],d=String(n).toUpperCase().split(" ");return o=d.length==1?d[0]?d[0].charAt(0):"?":d[0].charAt(0)+d[1].charAt(0),e.devicePixelRatio&&(i*=e.devicePixelRatio),a=("?"==o?72:o.charCodeAt(0))-64,r=a%20,s=t.createElement("canvas"),s.width=i,s.height=i,c=s.getContext("2d"),c.fillStyle=u[r-1],c.fillRect(0,0,s.width,s.height),c.font=Math.round(s.width/2)+"px Arial",c.textAlign="center",c.fillStyle="#FFF",25>i?c.fillText(o,i/2,i/1.37):"U"===o||"V"===o||"W"===o?c.fillText(o,i/2,i/1.42):c.fillText(o,i/2,i/1.48),l=s.toDataURL(),s=null,l}if(n.transform=function(){Array.prototype.forEach.call(t.querySelectorAll("img[avatar]"),function(e,t){t=e.getAttribute("avatar"),e.src=n(t,e.getAttribute("width")),e.removeAttribute("avatar"),e.setAttribute("alt",t)})},"function"==typeof define&&define.amd)define(function(){return n});else if("undefined"!=typeof exports)"undefined"!=typeof module&&module.exports&&(exports=module.exports=n),exports.LetterAvatar=n;else{window.LetterAvatar=n;var i=window.MutationObserver||window.WebKitMutationObserver;if(i){var o={childList:!0,subtree:!0,characterData:!0},a=new i(function(){n.transform()});a.observe(t,o)}else t.addEventListener&&(t.addEventListener("DOMContentLoaded",function(){n.transform()}),t.addEventListener("DOMSubtreeModified",function(){n.transform()}),t.addEventListener("DOMNodeInserted",function(){n.transform()}))}}(window,document),function(){this.Flash={hasElement:!1,show:function(e,t){var n,i,o;return null==t&&(t="info"),o='<div data-notify="container" class="ui {0} message" role="alert"><i data-notify="dismiss" class="close icon"></i><span data-notify="message">{2}</span></div>',n={message:e},i={type:t},e?(i.delay=3e3,i.template=o,i.offset={x:10,y:30},i.element="#messages-container",this.hasElement||this.findOrInitElement(i),$.notify(n,i)):void 0},findOrInitElement:function(e){var t,n;return t=$(e.element),t.length||(n=e.element.replace("#",""),$("body").append('<div class="flash-messages" id="'+n+'"></div>')),this.hasElement=!0}}}.call(this)

    思路一样就不造轮子了,这是码云网站的给没有上传图像用户指认用户名第一个字符作为头像的代码。

    自己可以代码反压缩一下看里面的具体思路。

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  • 原文地址:https://www.cnblogs.com/kiter/p/7808458.html
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