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Javascript实现苹果悬浮虚拟按钮
直接引入代码到页面即可
代码有部分冗余的地方,有兴趣的小伙伴可也自己修改
如果有什么BUG 记得评论 告诉我哦
web-touch.js
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 = " <div></div>" ;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; } //IEposX = 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;}//IEif((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("touchstart", fdiv.onmousedown, 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)<=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("touchend", 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");}
html
<!doctype html><html ><head><meta charset="UTF-8"><title>Document</title> </head><body> </body><script src="web-touch.js" type="text/javascript"></script></html>
演示图