HTML5 SVG带圆形进度条动画的提交按钮特效

<div id="progress-button" class="progress-button">
  <!-- 提交按钮 -->
  <button><span>Submit</span></button>
 
  <!-- svg 圆形进度条 -->
  <svg class="progress-circle" width="70" height="70">
    <path d="m35,2.5c17.955803,0 32.5,14.544199 32.5,32.5c0,17.955803 -14.544197,32.5 -32.5,32.5c-17.955803,
    0 -32.5,-14.544197 -32.5,-32.5c0,-17.955801 14.544197,-32.5 32.5,-32.5z"/>
  </svg>
 
  <!-- 提交成功的标记 -->
  <svg class="checkmark" width="70" height="70">
    <path d="m31.5,46.5l15.3,-23.2"/>
    <path d="m31.5,46.5l-8.5,-7.1"/>
  </svg>
 
  <!-- 提交失败的标记 -->
  <svg class="cross" width="70" height="70">
    <path d="m35,35l-9.3,-9.3"/>
    <path d="m35,35l9.3,9.3"/>
    <path d="m35,35l-9.3,9.3"/>
    <path d="m35,35l9.3,-9.3"/>
  </svg>
</div>

.progress-button {
  position: relative;
  display: inline-block;
  text-align: center;
}

.progress-button button {
  display: block;
  margin: 0 auto;
  padding: 0;
  width: 250px;
  height: 70px;
  border: 2px solid #1ECD97;
  border-radius: 40px;
  background: transparent;
  color: #1ECD97;
  letter-spacing: 1px;
  font-size: 18px;
  font-family: 'Montserrat', sans-serif;
  -webkit-transition: background-color 0.3s, 
                      color 0.3s, width 0.3s, 
                      border-width 0.3s, 
                      border-color 0.3s;
  transition: background-color 0.3s, 
              color 0.3s, width 0.3s, 
              border-width 0.3s, 
              border-color 0.3s;
}

.progress-button button:hover {
  background-color: #1ECD97;
  color: #fff;
}

.progress-button svg {
  position: absolute;
  top: 0;
  left: 50%;
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
  pointer-events: none;
}

.progress-button svg path {
  opacity: 0;
  fill: none;
}

.progress-button svg.progress-circle path {
  stroke: #1ECD97;
  stroke-width: 5;
}

.loading.progress-button button {
  width: 70px; /* 制作一个圆形 */
  border-width: 5px;
  border-color: #ddd;
  background-color: transparent;
  color: #fff;
}

.loading.progress-button span {
  -webkit-transition: opacity 0.15s;
  transition: opacity 0.15s;
}
.loading.progress-button span,
.success.progress-button span,
.error.progress-button span {
  opacity: 0; /* keep it hidden in all states */
}

function UIProgressButton( el, options ) {
  this.el = el;
  this.options = extend( {}, this.options );
  extend( this.options, options );
  this._init();
}
 
UIProgressButton.prototype._init = function() {
  this.button = this.el.querySelector( 'button' );
  this.progressEl = new SVGEl( this.el.querySelector( 'svg.progress-circle' ) );
  this.successEl = new SVGEl( this.el.querySelector( 'svg.checkmark' ) );
  this.errorEl = new SVGEl( this.el.querySelector( 'svg.cross' ) );
  // init events
  this._initEvents();
  // enable button
  this._enable();
}