React组件中的this的有血有肉运用,怎么着在VB中动用正则表达式

  1. 启动 Microsoft Visual Basic 6.0。

  2. 在“文件”菜单上,单击“新建项目”。

  3. 在“新建项目”对话框中,单击“Standard Exe”,然后单击“确定”。

HTML5非常酷,利用HTML5制作动画简直让我们忘记了这世界上还有flash的存在。今天我们要分享的一些HTML5动画都还不错,有些动画设计还是挺别出心裁的。另外,每一款HTML5动画都提供源代码下载,并且我们对源码作一些简单的分析。

React组件的this是什么

默认情况下将创建 Form1。

HTML5画图特效 超酷的笔刷动画

这是一款基于HTML5的画笔动画,可以选择不同的笔刷形状,笔刷在画布上移动时就会播放非常绚丽的动画效果。

核心jQuery代码:

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var H = 0;    $('.button').bind('mousedown touchstart',function(e) {    $('.clicked').removeClass('clicked');    $(this).addClass('clicked');  });    $(document).bind('mousemove touchmove',function(e) {      e.preventDefault();      var drawSize = 55;      var drawType = $('.clicked').html();      var floatTypes = Array('floatOne','floatTwo','floatThree','floatFour','floatFive');      var floatType = floatTypes[Math.floor(Math.random()*floatTypes.length)];      var xPos = e.originalEvent.pageX;      var yPos = e.originalEvent.pageY;            $('body').append('<div   +drawSize+'px;left:'+xPos+'px;top:'+yPos+'px;-webkit-animation:'+floatType+' .9s 1;-moz-animation:'+floatType+' .9s 1;color:hsla('+H+',100%,70%,1)">'+drawType+'</div>');          $('.draw').each(function() {        var div = $(this);        setTimeout(function() {$(div).remove();},800);      });  });    setInterval(function() {    if(H<=360) {H++;}    else {H=0;}  },10);

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在线演示        源码下载

通过编写一个简单组件,并渲染出来,分别打印出自定义函数和render中的this:

  1. 在“项目”菜单上单击“引用”。

  2. 双击“Microsoft VBScript Regular Expressions 5.5”,然后单击“确定”。

  3. 在工具箱中,双击“命令按钮”。

HTML5可爱的404页面动画 很逗的机器人

利用HTML5绘制的机器人,还会动哦。你可以将它作为一个富有创意的404页面。

核心CSS3代码:

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@-webkit-keyframes move {    0%, 100% {      -webkit-transform: rotate(0deg) translate3d(0px, 0px, 0px);      transform: rotate(0deg) translate3d(0px, 0px, 0px);    }      25% {      -webkit-transform: rotate(5deg) translate3d(5px, 5px, 0px);      transform: rotate(5deg) translate3d(5px, 5px, 0px);    }      75% {      -webkit-transform: rotate(-6deg) translate3d(-5px, 5px, 0px);      transform: rotate(-6deg) translate3d(-5px, 5px, 0px);    }  }    @keyframes move {    0%, 100% {      -webkit-transform: rotate(0deg) translate3d(0px, 0px, 0px);      transform: rotate(0deg) translate3d(0px, 0px, 0px);    }      25% {      -webkit-transform: rotate(5deg) translate3d(5px, 5px, 0px);      transform: rotate(5deg) translate3d(5px, 5px, 0px);    }      75% {      -webkit-transform: rotate(-6deg) translate3d(-5px, 5px, 0px);      transform: rotate(-6deg) translate3d(-5px, 5px, 0px);    }  }

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在线演示        源码下载

import React from 'react';

const STR = '被调用,this指向:';

class App extends React.Component{
  constructor(){
    super()
  }

  //测试函数
  handler() {
    console.log(`handler ${STR}`,this);
  }

  render(){

    console.log(`render ${STR}`,this);
    return(
      <div>
        <h1>hello World</h1>
        <label htmlFor = 'btn'>单击打印函数handler中this的指向</label>
        <input id = "btn" type="button" value = '单击' onClick = {this.handler}/>
      </div>    
    )
  }
}
export default App

默认情况下,“Command1”将添加到窗体中。

HTML5/jQuery 3D焦点图插件 多种超酷切换动画

焦点图是很传统的jQuery插件,但是这款焦点图基于HTML5,动画特效更加丰富。

 

图片 7

在线演示        源码下载

结果如图:

  1. 双击“Command1”以打开代码窗口。

CSS3各大网站分享按钮 带网站Logo小图标

这些按钮样式非常丰富,而且还带有网站的Logo,这些超酷的按钮都是利用CSS3实现的。

核心CSS3代码:

图片 8图片 9

.zocial.icon {      overflow: hidden;      max-width: 2.4em;      padding-left: 0;      padding-right: 0;      max-height: 2.15em;      white-space: nowrap;  }  .zocial.icon:before {      padding: 0;      width: 2em;      height: 2em;            -webkit-box-shadow: none;            box-shadow: none;      border: none;  }  .zocial:active {      background-image: -webkit-gradient(linear, left top, left bottom, from(rgba(255,255,255,.1)), color-stop(30%, rgba(255,255,255,0)), color-stop(50%, transparent), to(rgba(0,0,0,.1)));      background-image: -webkit-linear-gradient(bottom, rgba(255,255,255,.1), rgba(255,255,255,0) 30%, transparent 50%, rgba(0,0,0,.1));      background-image: -webkit-gradient(linear, left bottom, left top, from(rgba(255,255,255,.1)), color-stop(30%, rgba(255,255,255,0)), color-stop(50%, transparent), to(rgba(0,0,0,.1)));      background-image: linear-gradient(bottom, rgba(255,255,255,.1), rgba(255,255,255,0) 30%, transparent 50%, rgba(0,0,0,.1));  }

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在线演示        源码下载

图片 11

8.
将下面的代码粘贴到“Command1_Click”事件处理程序:MsgBox(TestRegExp(“is.”,
“IS1 is2 IS3 is4″))

HTML5 SVG环形图表应用 很酷的数据初始动画

很有创意的HTML5图表应用,图表是环形的,初始化时的动画效果也非常不错。

核心jQuery代码:

图片 12图片 13

$(function(){    $("#doughnutChart").drawDoughnutChart([      { title: "Tokyo",         value : 120,  color: "#2C3E50" },      { title: "San Francisco", value:  80,   color: "#FC4349" },      { title: "New York",      value:  70,   color: "#6DBCDB" },      { title: "London",        value : 50,   color: "#F7E248" },      { title: "Sydney",        value : 40,   color: "#D7DADB" },      { title: "Berlin",        value : 20,   color: "#FFF" }    ]);  });  /*!   * jquery.drawDoughnutChart.js   * Version: 0.3(Beta)   * Inspired by Chart.js(http://www.chartjs.org/)   *   * Copyright 2013 hiro   * https://github.com/githiro/drawDoughnutChart   * Released under the MIT license.   *    */  ;(function($, undefined) {    $.fn.drawDoughnutChart = function(data, options) {      var $this = this,        W = $this.width(),        H = $this.height(),        centerX = W/2,        centerY = H/2,        cos = Math.cos,        sin = Math.sin,        PI = Math.PI,        settings = $.extend({          segmentShowStroke : true,          segmentStrokeColor : "#0C1013",          segmentStrokeWidth : 1,          baseColor: "rgba(0,0,0,0.5)",          baseOffset: 4,          edgeOffset : 10,//offset from edge of $this          percentageInnerCutout : 75,          animation : true,          animationSteps : 90,          animationEasing : "easeInOutExpo",          animateRotate : true,          tipOffsetX: -8,          tipOffsetY: -45,          tipClass: "doughnutTip",          summaryClass: "doughnutSummary",          summaryTitle: "TOTAL:",          summaryTitleClass: "doughnutSummaryTitle",          summaryNumberClass: "doughnutSummaryNumber",          beforeDraw: function() {  },          afterDrawed : function() {  },          onPathEnter : function(e,data) {  },          onPathLeave : function(e,data) {  }        }, options),        animationOptions = {          linear : function (t) {            return t;          },          easeInOutExpo: function (t) {            var v = t<.5 ? 8*t*t*t*t : 1-8*(--t)*t*t*t;            return (v>1) ? 1 : v;          }        },        requestAnimFrame = function() {          return window.requestAnimationFrame ||            window.webkitRequestAnimationFrame ||            window.mozRequestAnimationFrame ||            window.oRequestAnimationFrame ||            window.msRequestAnimationFrame ||            function(callback) {              window.setTimeout(callback, 1000 / 60);            };        }();        settings.beforeDraw.call($this);        var $svg = $('<svg width="' + W + '" height="' + H + '" viewBox="0 0 ' + W + ' ' + H + '" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"></svg>').appendTo($this),          $paths = [],          easingFunction = animationOptions[settings.animationEasing],          doughnutRadius = Min([H / 2,W / 2]) - settings.edgeOffset,          cutoutRadius = doughnutRadius * (settings.percentageInnerCutout / 100),          segmentTotal = 0;        //Draw base doughnut      var baseDoughnutRadius = doughnutRadius + settings.baseOffset,          baseCutoutRadius = cutoutRadius - settings.baseOffset;      var drawBaseDoughnut = function() {          //Calculate values for the path.          //We needn't calculate startRadius, segmentAngle and endRadius, because base doughnut doesn't animate.          var startRadius = -1.570,// -Math.PI/2              segmentAngle = 6.2831,// 1 * ((99.9999/100) * (PI*2)),              endRadius = 4.7131,// startRadius + segmentAngle              startX = centerX + cos(startRadius) * baseDoughnutRadius,              startY = centerY + sin(startRadius) * baseDoughnutRadius,              endX2 = centerX + cos(startRadius) * baseCutoutRadius,              endY2 = centerY + sin(startRadius) * baseCutoutRadius,              endX = centerX + cos(endRadius) * baseDoughnutRadius,              endY = centerY + sin(endRadius) * baseDoughnutRadius,              startX2 = centerX + cos(endRadius) * baseCutoutRadius,              startY2 = centerY + sin(endRadius) * baseCutoutRadius;          var cmd = [            'M', startX, startY,            'A', baseDoughnutRadius, baseDoughnutRadius, 0, 1, 1, endX, endY,            'L', startX2, startY2,            'A', baseCutoutRadius, baseCutoutRadius, 0, 1, 0, endX2, endY2,//reverse            'Z'          ];          $(document.createElementNS('http://www.w3.org/2000/svg', 'path'))            .attr({              "d": cmd.join(' '),              "fill": settings.baseColor            })            .appendTo($svg);      }();        //Set up pie segments wrapper      var $pathGroup = $(document.createElementNS('http://www.w3.org/2000/svg', 'g'));      $pathGroup.attr({opacity: 0}).appendTo($svg);        //Set up tooltip      var $tip = $('<div  + settings.tipClass + '" />').appendTo('body').hide(),          tipW = $tip.width(),          tipH = $tip.height();        //Set up center text area      var summarySize = (cutoutRadius - (doughnutRadius - cutoutRadius)) * 2,          $summary = $('<div  + settings.summaryClass + '" />')                     .appendTo($this)                     .css({                        width: summarySize + "px",                       height: summarySize + "px",                       "margin-left": -(summarySize / 2) + "px",                       "margin-top": -(summarySize / 2) + "px"                     });      var $summaryTitle = $('<p  + settings.summaryTitleClass + '">' + settings.summaryTitle + '</p>').appendTo($summary);      var $summaryNumber = $('<p  + settings.summaryNumberClass + '"></p>').appendTo($summary).css({opacity: 0});        for (var i = 0, len = data.length; i < len; i++) {        segmentTotal += data[i].value;        $paths[i] = $(document.createElementNS('http://www.w3.org/2000/svg', 'path'))          .attr({            "stroke-width": settings.segmentStrokeWidth,            "stroke": settings.segmentStrokeColor,            "fill": data[i].color,            "data-order": i          })          .appendTo($pathGroup)          .on("mouseenter", pathMouseEnter)          .on("mouseleave", pathMouseLeave)          .on("mousemove", pathMouseMove);      }        //Animation start      animationLoop(drawPieSegments);        function pathMouseEnter(e) {        var order = $(this).data().order;        $tip.text(data[order].title + ": " + data[order].value)            .fadeIn(200);        settings.onPathEnter.apply($(this),[e,data]);      }      function pathMouseLeave(e) {        $tip.hide();        settings.onPathLeave.apply($(this),[e,data]);      }      function pathMouseMove(e) {        $tip.css({          top: e.pageY + settings.tipOffsetY,          left: e.pageX - $tip.width() / 2 + settings.tipOffsetX        });      }      function drawPieSegments (animationDecimal) {        var startRadius = -PI / 2,//-90 degree            rotateAnimation = 1;        if (settings.animation && settings.animateRotate) rotateAnimation = animationDecimal;//count up between0~1          drawDoughnutText(animationDecimal, segmentTotal);          $pathGroup.attr("opacity", animationDecimal);          //draw each path        for (var i = 0, len = data.length; i < len; i++) {          var segmentAngle = rotateAnimation * ((data[i].value / segmentTotal) * (PI * 2)),              endRadius = startRadius + segmentAngle,              largeArc = ((endRadius - startRadius) % (PI * 2)) > PI ? 1 : 0,              startX = centerX + cos(startRadius) * doughnutRadius,              startY = centerY + sin(startRadius) * doughnutRadius,              endX2 = centerX + cos(startRadius) * cutoutRadius,              endY2 = centerY + sin(startRadius) * cutoutRadius,              endX = centerX + cos(endRadius) * doughnutRadius,              endY = centerY + sin(endRadius) * doughnutRadius,              startX2 = centerX + cos(endRadius) * cutoutRadius,              startY2 = centerY + sin(endRadius) * cutoutRadius;          var cmd = [            'M', startX, startY,//Move pointer            'A', doughnutRadius, doughnutRadius, 0, largeArc, 1, endX, endY,//Draw outer arc path            'L', startX2, startY2,//Draw line path(this line connects outer and innner arc paths)            'A', cutoutRadius, cutoutRadius, 0, largeArc, 0, endX2, endY2,//Draw inner arc path            'Z'//Cloth path          ];          $paths[i].attr("d", cmd.join(' '));          startRadius += segmentAngle;        }      }        function drawDoughnutText(animationDecimal, segmentTotal) {        $summaryNumber          .css({opacity: animationDecimal})          .text((segmentTotal * animationDecimal).toFixed(1));      }      function animateFrame(cnt, drawData) {        var easeAdjustedAnimationPercent =(settings.animation)? CapValue(easingFunction(cnt), null, 0) : 1;        drawData(easeAdjustedAnimationPercent);      }      function animationLoop(drawData) {        var animFrameAmount = (settings.animation)? 1 / CapValue(settings.animationSteps, Number.MAX_VALUE, 1) : 1,            cnt =(settings.animation)? 0 : 1;        requestAnimFrame(function() {            cnt += animFrameAmount;            animateFrame(cnt, drawData);            if (cnt <= 1) {              requestAnimFrame(arguments.callee);            } else {              settings.afterDrawed.call($this);            }        });      }      function Max(arr) {        return Math.max.apply(null, arr);      }      function Min(arr) {        return Math.min.apply(null, arr);      }      function isNumber(n) {        return !isNaN(parseFloat(n)) && isFinite(n);      }      function CapValue(valueToCap, maxValue, minValue) {        if (isNumber(maxValue) && valueToCap > maxValue) return maxValue;        if (isNumber(minValue) && valueToCap < minValue) return minValue;        return valueToCap;      }      return $this;    };  })(jQuery);

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在线演示        源码下载

可以看到,render函数中的this指向了组件实例,而handler()函数中的this则为undefined,这是为何?

注意 这个示例中将对照“IS1 is2 IS3 is4”字符串检查 is.
模式。您可以将句点这一特殊字符(.)用作通配符,这样,搜索模式就能够多匹配并多显示一个字符。如果www.x-force.cn您在搜索模式中添加两个句点,您会看到两个其他字符。如果您不使用任何句点,您只会看到搜索模式。

HTML5迷你音乐播放器 3D翻转播放按钮

很有创意的HTML5音乐播放器,而且播放按钮还有3D的动画效果,整个播放器也是相当迷你。

核心jQuery代码:

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// Most of this is all Dave Rupert  // See http://codepen.io/davatron5000/pen/uqktG    (function(){    $(".play-pause").click(function() {       if($(this).hasClass('pausing')){        $(this).removeClass('pausing');        $(this).addClass('playing');        $(this).css("background-image", "url(http://dev.steelehouse.com/codepen/play-to-pause-faster.gif)");        audio.play();    }    else if($(this).hasClass('playing')){        $(this).removeClass('playing');        $(this).addClass('pausing');        $(this).css("background-image", "url(http://dev.steelehouse.com/codepen/pause-to-play-faster.gif)");        audio.pause();    }    else {      $(this).addClass('playing');      $(this).css("background-image", "url(http://dev.steelehouse.com/codepen/play-to-pause-faster.gif)");      audio.play();    }      });          var pcastPlayers = document.querySelectorAll('.player-container');    var speeds = [ 1, 1.5, 2, 2.5, 3, 0.5 ]            for(i=0;i<pcastPlayers.length;i++) {      var player = pcastPlayers[i];      var audio = player.querySelector('audio');/*      var play = player.querySelector('.play-pause.playing');      var pause = player.querySelector('.play-pause.pausing');*/                    var progress = player.querySelector('.pcast-progress');        var currentTime = player.querySelector('.pcast-currenttime');            var currentSpeedIdx = 0;              var toHHMMSS = function ( totalsecs ) {          var sec_num = parseInt(totalsecs, 10); // don't forget the second param          var hours   = Math.floor(sec_num / 3600);          var minutes = Math.floor((sec_num - (hours * 3600)) / 60);          var seconds = sec_num - (hours * 3600) - (minutes * 60);            if (hours   < 10) {hours   = "0"+hours; }          if (minutes < 10) {minutes = ""+minutes;}          if (seconds < 10) {seconds = "0"+seconds;}                    var time = hours+':'+minutes+':'+seconds;          if (hours   <= 1) { var time = minutes+':'+seconds; }                  return time;      }            audio.addEventListener('loadedmetadata', function(){        progress.setAttribute('max', Math.floor(audio.duration));        duration.textContent  = toHHMMSS(audio.duration);      });            audio.addEventListener('timeupdate', function(){        progress.setAttribute('value', audio.currentTime);        currentTime.textContent  = toHHMMSS(audio.currentTime);      });        /*    play.addEventListener('click', function(){        this.style.display = 'none';        pause.style.display = 'inline-block';        pause.focus();        audio.play();      }, false);        pause.addEventListener('click', function(){        this.style.display = 'none';        play.style.display = 'inline-block';        play.focus();        audio.pause();      }, false);  */            progress.addEventListener('click', function(e){        audio.currentTime = Math.floor(audio.duration) * (e.offsetX / e.target.offsetWidth);      }, false);                }  })(this);

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在线演示        源码下载

JavaScript函数中的this

  1. 将以下函数添加到“Command1_click”事件处理程序后:

HTML5/CSS3实现蝙蝠侠人物动画 蜘蛛侠变身

用CSS3实现的人物拼接动画,效果非常不错。

核心CSS3代码:

图片 18图片 19

@-webkit-keyframes ani-head-1-0 {      0% {          -webkit-transform: translate3d(-322.74999999999994px, 121.99999999999994px, 0px);          background-color: rgba(53,53,53,1);      }        98.912% {          -webkit-transform: translate3d(67px, 123px, 0px);          background-color: rgba(53,53,53,1);      }        100% {          -webkit-transform: translate3d(67px, 123px, 0px);          background-color: rgba(53,53,53,1);      }  }    @keyframes ani-head-1-0 {      0% {          transform: translate3d(-322.74999999999994px, 121.99999999999994px, 0px);          background-color: rgba(53,53,53,1);      }        98.912% {          transform: translate3d(67px, 123px, 0px);          background-color: rgba(53,53,53,1);      }        100% {          transform: translate3d(67px, 123px, 0px);          background-color: rgba(53,53,53,1);      }  }

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在线演示        源码下载


我们都知道JavaScript函数中的this不是在函数声明的时候定义的,而是在函数调用(即运行)的时候定义的

[codes=vb]Function TestRegExp(myPattern As String, myString As String)

var student = {
  func: function() {
    console.log(this);
  };
};

student.func();
var studentFunc = student.func;
studentFunc();

”Create objects.

这段代码运行,可以看到student.func()打印了student对象,因为此时this指向student对象;而studentFunc()打印了window,因为此时由window调用的,this指向window。

Dim objRegExp As RegExp

这段代码形象的验证了,JavaScript函数中的this不是在函数声明的时候,而是在函数运行的时候定义的;

Dim objMatch As Match

同样,React组件也遵循JavaScript的这种特性,所以组件方法的‘调用者’不同会导致this的不同(这里的
“调用者” 指的是函数执行时的当前对象)

Dim colMatches As MatchCollection

“调用者”不同导致this不同

Dim RetStr As String

测试:分别在组件自带的生命周期函数以及自定义函数中打印this,并在render()方法中分别使用this.handler(),window.handler(),onCilck={this.handler}这三种方法调用handler():

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