Javascript creates imitation Apple touch screen effect

This time I will bring you Javascript to create an imitation Apple touch screen effect. What are the precautions for using Javascript to create an imitation Apple touch screen effect? ​​The following is a practical case, let’s take a look.

Javascript to make imitation apple white spots
Just introduce the code directly into the page
The code has some redundant parts, interested friends can modify it themselves
If there are any BUGs Remember to comment and tell me

var new_element_N=document.createElement("style");
    new_element_N.innerHTML = '#drager {' +
        '     position: fixed;' +
        '     width: 35px;' +
        '     height: 35px;' +
        '     background-color: rgba(0, 0, 0, 0.2);' +
        '     z-index: 10000;' +
        '     cursor: pointer;' +
        '     top: 0px;' +
        '     left: 0px;' +
        '     border-radius: 30%;' +
        '     padding: 6px;' +
        ' }' +
        ' ' +
        ' #drager>div {' +
        '     border-radius: 50%;' +
        '     width: 100%;' +
        '     height: 100%;' +
        '     background-color: rgba(0, 0, 0, 0.3);' +
        '      transition: all 0.2s;' +
        '   -webkit-transition: all 0.2s;' +
        '   -moz-transition: all 0.2s;' +
        '   -o-transition: all 0.2s;' +
        ' }' +
        ' #drager:hover>div{' +
       '      background-color: rgba(0, 0, 0, 0.6);' +
       ' } ';
    document.body.appendChild(new_element_N);
    new_element_N=document.createElement('div');
    new_element_N.setAttribute("id","drager");
    new_element_N.style.top="100px";
    new_element_N.style.left="100px";
    new_element_N.innerHTML = &#39; <div></div>&#39; ;
    document.body.appendChild(new_element_N);
    //
    //
        var posX;
        var posY;     
        var screenWidth =document.documentElement.clientWidth;
        var screenHeight = document.documentElement.clientHeight;  
        var fdiv = document.getElementById("drager"); 
        fdiv.onmousedown=function(e)
        {
            screenWidth =document.documentElement.clientWidth;
            screenHeight = document.documentElement.clientHeight;  
            if(!e){ e = window.event; } //IE
            posX = e.clientX - parseInt(fdiv.style.left);
            posY = e.clientY - parseInt(fdiv.style.top);
            document.onmousemove = mousemove;          
        }
        document.onmouseup = function()//释放时自动贴到最近位置
        {
            document.onmousemove = null;
            if((parseInt(fdiv.style.top)+parseInt(fdiv.clientHeight)/2)<=(screenHeight/2)){//在上半部分
                if((parseInt(fdiv.style.left)+parseInt(fdiv.clientWidth)/2)<=(screenWidth/2)){//在左半部分
                    if((parseInt(fdiv.style.top)+parseInt(fdiv.clientHeight)/2)<=(parseInt(fdiv.style.left)+parseInt(fdiv.clientWidth)/2)){//靠近上方
                        fdiv.style.top="0px";
                    }else{//靠近左边
                        fdiv.style.left="0px";
                    }
                }else{//在右半部分
                    if((parseInt(fdiv.style.top)+parseInt(fdiv.clientHeight)/2)<=(screenWidth-(parseInt(fdiv.style.left)+parseInt(fdiv.clientWidth)/2)) ){//靠近上方
                        fdiv.style.top="0px";
                    }else{//靠近右边
                        fdiv.style.left=(screenWidth-parseInt(fdiv.clientWidth))+"px";
                    }
                }
            }else{ //下半部分
                 if((parseInt(fdiv.style.left)+parseInt(fdiv.clientWidth)/2)<=(screenWidth/2)){//在左半部分
                    if( (screenHeight-(parseInt(fdiv.style.top)+parseInt(fdiv.clientHeight)/2))<=(parseInt(fdiv.style.left)+parseInt(fdiv.clientWidth)/2)){//靠近下方
                        fdiv.style.top=(screenHeight-parseInt(fdiv.clientHeight))+"px";
                    }else{//靠近左边
                        fdiv.style.left="0px";
                    }
                }else{//在右半部分
                    if( (screenHeight-(parseInt(fdiv.style.top)+parseInt(fdiv.clientHeight)/2))<=(screenWidth-(parseInt(fdiv.style.left)+parseInt(fdiv.clientWidth)/2)) ){//靠近上方
                        fdiv.style.top=(screenHeight-parseInt(fdiv.clientHeight))+"px";
                    }else{//靠近右边
                        fdiv.style.left=(screenWidth-parseInt(fdiv.clientWidth))+"px";
                    }
                }
            }
        }
        function mousemove(ev)
        {
            if(ev==null){ ev = window.event;}//IE
            if((ev.clientY - posY)<=0){//超过顶部
                 fdiv.style.top="0px";
            }else if((ev.clientY - posY) >(screenHeight-parseInt(fdiv.clientHeight))){//超过底部
                fdiv.style.top=(screenHeight-parseInt(fdiv.clientHeight))+"px";
            }else{
                fdiv.style.top = (ev.clientY - posY) + "px";
            }
             
             if((ev.clientX- posX)<=0){//超过左边
                 fdiv.style.left="0px";
            }else if((ev.clientX - posX) >(screenWidth-parseInt(fdiv.clientWidth))){//超过右边
                fdiv.style.left=(screenWidth-parseInt(fdiv.clientWidth))+"px";
            }else{
                fdiv.style.left = (ev.clientX - posX) + "px";
            }
            // console.log( posX +"  "+ fdiv.style.left);
             
        }
       window.onload =  window.onresize = function() { //窗口大小改变事件
            screenWidth =document.documentElement.clientWidth;
            screenHeight = document.documentElement.clientHeight;  
            if( (parseInt(fdiv.style.top)+parseInt(fdiv.clientHeight))>screenHeight){//窗口改变适应超出的部分
                 fdiv.style.top=(screenHeight-parseInt(fdiv.clientHeight))+"px";
            }   
            if( (parseInt(fdiv.style.left)+parseInt(fdiv.clientWidth))>screenWidth){//窗口改变适应超出的部分
                 fdiv.style.left=(screenWidth-parseInt(fdiv.clientWidth))+"px";
            }   
            document.onmouseup.apply()
        };
        fdiv.addEventListener(&#39;touchstart&#39;,  fdiv.onmousedown, false);  
        fdiv.addEventListener(&#39;touchmove&#39;, 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)<=0){//超过顶部
                                fdiv.style.top="0px";
                            }else if(touch.pageY>(screenHeight-parseInt(fdiv.clientHeight))){//超过底部
                                fdiv.style.top=(screenHeight-parseInt(fdiv.clientHeight))+"px";
                            }else{
                                fdiv.style.top = (touch.pageY-parseInt(fdiv.clientHeight)/2) + "px";
                            }
                             
                            if(touch.pageX<=0){//超过左边
                                fdiv.style.left="0px";
                            }else if( touch.pageX >(screenWidth-parseInt(fdiv.clientWidth))){//超过右边
                                fdiv.style.left=(screenWidth-parseInt(fdiv.clientWidth))+"px";
                            }else{
                                fdiv.style.left = (touch.pageX-parseInt(fdiv.clientWidth)/2) + "px";
                            }
                       }
                    }, false);
        fdiv.addEventListener(&#39;touchend&#39;, document.onmouseup , false);            
        fdiv.ondblclick=function(){//双击事件可能在手机端浏览器会与网页缩放事件冲突
            alert("发挥你们的想象力吧");
        }

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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