js仿苹果悬浮可拖拽按钮，并且点击展开效果

摘要：今天写了一个仿苹果的悬浮按钮，由于只在右侧展开，所以只能上下拖拽，展开效果入下拖拽如果这个元素的位置内只有一个手指的话阻止浏览器默认事件，重要超过顶部超过底部

今天写了一个仿苹果的悬浮按钮，由于只在右侧展开，所以只能上下拖拽，展开效果入下

1.html

2.css

@charset "gb2312";
.info-nr {position:fixed;
    top:70px;
    right:3px;
    z-index:900;
    tap-highlight-color: rgba(0, 0, 0, 0);
}     
#toMenu{display:block;
    width:45px!important;
    height:45px!important;
    border-radius:45px;
    position: absolute;
    bottom:0;
    right:0;
    z-index:9999;
    color:#fff;
    background:url(../img/navimg/png2.png) 50% 50% #3498fe;
    background-repeat: no-repeat;
    background-size:auto 62%;
    box-shadow:0 0 0 3px #3498fe, 0 2px 5px 0 #3498fe;
}
.info-nr-phone{height:45px;width:45px;}
#info-nr-phone{position:relative;}
.info-nr-phone>div {
    width:40px;
    height:40px;
    border-radius:40px;
    box-shadow:0 0 0 3px #FFFFFF, 0 2px 5px 0 rgba(0, 0, 0, 0.25);
    position:absolute;
    bottom:2px;
    right:2px;
    z-index:900;
    -moz-transition: transform 200ms;
    -webkit-transition: -webkit-transform 200ms;
    -ms-transition: transform 200ms;
}
.info-nr-phone>.to_01 {-webkit-transform: translate(-14px, -120px) rotate(720deg); 
                           -moz-transform: translate(-14px, -120px) rotate(720deg);
                            -ms-transform: translate(-14px, -120px) rotate(720deg); 
                             -o-transform: translate(-14px, -120px) rotate(720deg);
                                transform: translate(-14px, -65px) rotate(720deg);
                            background:url(../img/navimg/55.png) 50% 50% no-repeat #fff;
                                background-size:auto 66%;}
.info-nr-phone>.to_02 {-webkit-transform: translate(-78px, -108px) rotate(720deg); 
                           -moz-transform: translate(-78px, -108px) rotate(720deg);
                        -ms-transform: translate(-78px, -108px) rotate(720deg); 
                             -o-transform: translate(-78px, -108px) rotate(720deg); 
                                transform: translate(-71px, -31px) rotate(720deg);
                                background:url(../img/navimg/4.png) 50% 50% no-repeat #fff;
                                background-size:auto 70%;}
.info-nr-phone>.to_03 {-webkit-transform: translate(-85px, -80px) rotate(720deg); 
                           -moz-transform: translate(-85px, -80px) rotate(720deg);
                            -ms-transform: translate(-85px, -80px) rotate(720deg); 
                             -o-transform: translate(-85px, -80px) rotate(720deg);
                                 transform: translate(-67px, 28px) rotate(720deg);
                                background:url(../img/navimg/3.png) 50% 50% no-repeat #fff;
                                background-size:auto 60%;
                        }
.info-nr-phone> .to_04{-webkit-transform: translate(-79px, -36px) rotate(720deg);
                           -moz-transform: translate(-79px, -36px) rotate(720deg);
                            -ms-transform: translate(-79px, -36px) rotate(720deg);
                             -o-transform: translate(-79px, -36px) rotate(720deg); 
                                transform: translate(-15px, 62px) rotate(720deg);
                                background:url(../img/navimg/2.png) 50% 50% no-repeat #fff;
                                background-size:auto 60%;
                        } 

3.js

// JavaScript Document
window.addEventListener("DOMContentLoaded", function () {
    $("#toMenu").click(function(){
        $(".info-nr-phone").toggleClass("info-nr-phone2");
        $(".menu_01").toggleClass("to_01");
        $(".menu_02").toggleClass("to_02");
        $(".menu_03").toggleClass("to_03");
        $(".menu_04").toggleClass("to_04");
    });
}, false);
// 拖拽
var screenHeight = document.documentElement.clientHeight;  
var fdiv = document.getElementById("info-nr"); 
fdiv.addEventListener("touchstart", false);  
fdiv.addEventListener("touchmove", function(event) {
        // 如果这个元素的位置内只有一个手指的话
        if (event.targetTouches.length == 1) {
         event.preventDefault();// 阻止浏览器默认事件，重要 
          var touch = event.targetTouches[0]; 
          if((touch.pageY)<=70){//超过顶部
            fdiv.style.top="70px";
          }else if(touch.pageY>(screenHeight-parseInt(fdiv.clientHeight))){//超过底部
            fdiv.style.top=(screenHeight-parseInt(fdiv.clientHeight))-70+"px";
          }else{
            fdiv.style.top = (touch.pageY-parseInt(fdiv.clientHeight)/2) + "px";
          }
        }
}, false); 
fdiv.addEventListener("touchend", false);