huanggr
原生js实现拖动滑块验证，滑块验证可以防止机器人对网站的频繁试探，下面就带着大家来实现以下：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | <!DOCTYPE html> <html> <head> <title></title> </head> <style type="text/css"> #box { width: 200px; height: 35px; margin: 0 auto; position: relative; box-sizing: border-box; border: 1px solid #ccc; } .bg { position: absolute; top: 0; left: 0; height: 100%; background-color: green; } .btn { position: absolute; top: 0; left: 0; width: 100%; height: 100%; width: 50px; box-sizing: border-box; border: 1px solid #ccc; background-color: #333; } .text { line-height: 35px; text-align: center; color: red; position: absolute; width: 100%; } </style> <body> <div id="box"> <div class="bg"></div> <div class="text">拖动验证</div> <div class="btn"></div> </div> </body> <script type="text/javascript"> function init() { //原生js实现拖动滑块验证_封装版 var btn = document.querySelector('.btn'); var bg = document.querySelector('.bg'); var text = document.querySelector('.text'); var width = document.querySelector('#box').offsetWidth; var maxLeft = document.querySelector('#box').offsetWidth - btn.offsetWidth; var startX = 0; var isDown = false; function mousedown(e) { startX = e.clientX; isDown = true; } function mousemove(e) { if (!isDown) return false; var left = e.clientX - startX; if (left > 0) { btn.style.left = left + 'px'; bg.style.width = left + 'px'; if (left >= maxLeft) { text.innerText = '验证通过'; text.style.color = '#fff'; remove(); } } } function remove() { btn.removeEventListener('mousedown', mousedown, null); document.removeEventListener('mousemove', mousemove, null); document.removeEventListener('mouseup', mouseup, null); } function mouseup(e) { var clientX = e.clientX - startX; if (clientX < maxLeft) { isDown = false; btn.style.left = 0 + 'px'; bg.style.width = 0 + 'px'; } else { remove(); } } btn.addEventListener('mousedown', mousedown, null); document.addEventListener('mousemove', mousemove, null); document.addEventListener('mouseup', mouseup, null) } document.addEventListener('readystatechange', init, null) </script> </html> |
封装后的代码：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | function Drag(conf){ this.btn = this.getDom(conf.btn); this.bg = this.getDom(conf.bg); this.text = this.getDom(conf.text); this.box = this.getDom(conf.box ); this.width = this.box.offsetWidth; this.maxLeft = this.getDom(conf.box).offsetWidth - this.btn.offsetWidth; this.startX = 0; this.isDown = false; this.success = typeof conf.success == 'function' ? conf.success : null; this.mousedown = this.mousedown.bind(this); this.mousemove = this.mousemove.bind(this); this.mouseup = this.mouseup.bind(this); this.remove = this.remove.bind(this); this.btn.addEventListener('mousedown',this.mousedown,null); document.addEventListener('mousemove',this.mousemove,null); document.addEventListener('mouseup',this.mouseup,null) } Drag.prototype = { getDom:document.querySelector.bind(document), getDomAll:document.querySelectorAll.bind(document), mousedown:function (e){ this.startX = e.clientX; this.isDown = true; }, mousemove:function (e){ if(!this.isDown) return false; var left = e.clientX - this.startX; if(left > 0){ this.btn.style.left = left + 'px'; this.bg.style.width = left + 'px'; if(left >= this.maxLeft){ this.text.innerText = '验证通过'; this.text.style.color = '#fff'; this.remove(); } } }, remove:function (){ this.isDown = false; this.btn.removeEventListener('mousedown',this.mousedown,null); document.removeEventListener('mousemove',this.mousemove,null); document.removeEventListener('mouseup',this.mouseup,null); if(this.success != null){ this.success(); } }, mouseup:function (e){ var clientX = e.clientX - this.startX; if(clientX < this.maxLeft){ this.isDown = false; this.btn.style.left = 0 + 'px'; this.bg.style.width = 0 + 'px'; }else{ //this.remove.call(this); } } } function init(){ var drag = new Drag({ box:'#box', btn:'.btn', bg:'.bg', text:'.text', success:function(){ console.log('验证成功') } }); } document.addEventListener('readystatechange',init,null) ！ |
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