| 标题 | js实现照片墙功能实例 |
| 内容 | 本文实例讲述了js实现照片墙功能的方法。分享给大家供大家参考。具体实现方法如下： 复制代码 代码如下:<!doctype html> <html xmlns="" xmlns:html5=""> <head> <meta charset="utf-8"> <title>js照片墙</title> <meta http-equiv="X-UA-Compatible" content="edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="Keywords" content="js照片墙"> <meta name="description" content="js照片墙"> <link href="css/style.css" rel="stylesheet"> <script src="move.js"></script> <style> *{padding: 0; margin: 0;} li{list-style: none;} ul{width: 660px; height:510px; background:#ccc;margin: 20px auto;} li{width:200px; height: 150px; margin: 10px; float: left; } </style> <script> /* var arr=['a','b','c','d','e','d','f']; var pos = arr.lastIndexOf('d'); alert(pos); */ window.onload=function(){ var aLi = document.querySelectorAll('li'); var oInput = document.querySelector('#btn'); var pos = []; var len= aLi.length; var izIndex= 2; //布局转换 for(var i=0;i<len;i++){ pos.push([aLi[i].offsetLeft,aLi[i].offsetTop]); } for(var i=0;i<len;i++){ aLi[i].style.left=pos[i][0]+'px'; aLi[i].style.top=pos[i][1]+'px'; aLi[i].style.position = 'absolute'; aLi[i].style.margin = '0px'; } for(var i=0;i<len;i++){ aLi[i].index = i; setDrag(aLi[i]); } oInput.onclick=function(){ var randomArr = [0,1,2,3,4,5,6,7,8]; randomArr.sort(function(num1,num2){ return Math.random()-0.5; }) for(var i=0;i<len;i++){ //增加随机位置的情况 startMove(aLi[i],{left:pos[randomArr[i]][0],top:pos[randomArr[i]][1]}); //修正索引 aLi[i].index = randomArr[i]; } } //拖拽 function setDrag(obj){ obj.onmousedown =function(ev){ izIndex++; obj.style.zIndex= izIndex; var ev = ev || event; var disX = ev.clientX - obj.offsetLeft; var disY = ev.clientY - obj.offsetTop; document.onmousemove=function(ev){ var ev = ev || event; obj.style.left = ev.clientX- disX +'px'; obj.style.top = ev.clientY - disY +'px'; for(var i=0; i<len; i++){ aLi[i].style.border='none'; } var nL = nearLi(obj); if(nL){ nL.style.border='2px solid red'; } } document.onmouseup= function(){ document.onmousemove = null; document.onmouseup = null; var nL = nearLi(obj); if(nL){ nL.style.border='2px solid red'; startMove(obj,{left:pos[nL.index][0],top:pos[nL.index][1]}); startMove(nL,{left:pos[obj.index][0],top:pos[obj.index][1]}); var tmp =nL.index; nL.index = obj.index; obj.index = tmp; nL.style.border=''; }else{ startMove(obj,{left:pos[obj.index][0],top:pos[obj.index][1]}); } } return false; } } //检测是否有碰撞 function isDump(obj1,obj2){ var l1= obj1.offsetLeft; var r1= l1+obj1.offsetWidth; var t1= obj1.offsetTop; var b1 =obj1.offsetHeight +t1; var l2= obj2.offsetLeft; var r2= l2+obj2.offsetWidth; var t2= obj2.offsetTop; var b2 =obj2.offsetHeight +t2; if(b2<t1 || l2>r1 || r2<l1 || t2>b1){ return false; }else{ return true; } } //寻找最近的节点 function nearLi(obj){ var index= -1; var value =9999; for(var i=0; i<len; i++){ if(isDump(obj,aLi[i]) && obj !=aLi[i]){ var c = getDis(obj,aLi[i]); if(c <value){ value = c; index = i; } } } if(index !=-1){ return aLi[index]; }else{ return false; } } function getDis(obj1,obj2){ var x = obj1.offsetLeft - obj2.offsetLeft; var y = obj1.offsetTop - obj2.offsetTop; return Math.sqrt(Math.pow(x,2)+Math.pow(y,2)); } } </script> </head> <body> <button id="btn">click</button> <ul> <li><img src="1l.jpg" width="200px" height="150px"></li> <li><img src="2l.jpg" width="200px" height="150px"></li> <li><img src="3l.jpg" width="200px" height="150px"></li> <li><img src="4l.jpg" width="200px" height="150px"></li> <li><img src="5l.jpg" width="200px" height="150px"></li> <li><img src="6l.jpg" width="200px" height="150px"></li> <li><img src="1l.jpg" width="200px" height="150px"></li> <li><img src="2l.jpg" width="200px" height="150px"></li> <li><img src="4l.jpg" width="200px" height="150px"></li> </ul> </body> </html> 希望本文所述对大家的javascript程序设计有所帮助。 |
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