text: /**
   * 点击波纹效果
   *
   * @param  {[event]} e        [description]
   * @param  {[Object]} arg_opts [description]
   * @return {[bollean]}          [description]
   */
  export default function( e, arg_opts ) {
    var opts = Object.assign( {
      ele : e.target, // 波纹作用元素
      type : 'hit', // hit点击位置扩散center中心点扩展
      bgc : 'rgba(0, 0, 0, 0.15)' // 波纹颜色
    }, arg_opts )
    var target = opts.ele
    if ( target ) {
      var rect = target.getBoundingClientRect()
      var ripple = target.querySelector( '.e-ripple' )
      if ( !ripple ) {
        ripple = document.createElement( 'span' )
        ripple.className = 'e-ripple'
        ripple.style.height = ripple.style.width = Math.max( rect.width, rect.height ) + 'px'
        target.appendChild( ripple )
      } else {
        ripple.className = 'e-ripple'
      }
      switch ( opts.type ) {
        case 'center':
          ripple.style.top = ( rect.height / 2 - ripple.offsetHeight / 2 ) + 'px'
          ripple.style.left = ( rect.width / 2 - ripple.offsetWidth / 2 ) + 'px'
          break
        default:
          ripple.style.top = ( e.pageY - rect.top - ripple.offsetHeight / 2 - document.body.scrollTop ) + 'px'
          ripple.style.left = ( e.pageX - rect.left - ripple.offsetWidth / 2 - document.body.scrollLeft ) + 'px'
      }
      ripple.style.backgroundColor = opts.bgc
      ripple.className = 'e-ripple z-active'
      return false
    }
  }
  