您好,登錄后才能下訂單哦!
小編給大家分享一下js+html5如何實(shí)現(xiàn)手機(jī)九宮格密碼解鎖功能,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
HTML5真的是很強(qiáng)大,前端時間看到一個canvas實(shí)現(xiàn)九宮格的密碼解鎖。今天抽出時間模仿了一個,特定分享一下!
效果截圖如下:
效果看起來還不錯吧!
源碼如下:
<!DOCTYPE html> <html> <head lang="zh-CN"> <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"/> <meta charset="UTF-8"> <title>html5實(shí)現(xiàn)網(wǎng)頁解鎖功能</title> <style type="text/css"> html, body { margin: 0; padding: 0; width: 100%; height: 100%; } </style> <script type="text/javascript"> /** * 半徑,畫布寬度,畫布高度,畫布x內(nèi)邊距,畫布y內(nèi)邊距 */ var R = 26, canvasWidth = 400, canvasHeight = 320, OffsetX = 30, OffsetY = 30; var circleArr = []; function createCirclePoint(diffX, diffY) { for (var row = 0; row < 3; row++) { for (var col = 0; col < 3; col++) { // 計算圓心坐標(biāo) var Point = { X: (OffsetX + col * diffX + ( col * 2 + 1) * R), Y: (OffsetY + row * diffY + (row * 2 + 1) * R) }; circleArr.push(Point); } } } window.onload = function () { var canvas = document.getElementById("lockCanvas"); canvasWidth = document.body.offsetWidth;//網(wǎng)頁可見區(qū)域?qū)? canvas.width = canvasWidth; canvas.height = canvasHeight; var cxt = canvas.getContext("2d"); /** * 每行3個圓 * OffsetX為canvas x方向內(nèi)邊距 * */ var X = (canvasWidth - 2 * OffsetX - R * 2 * 3) / 2; var Y = (canvasHeight - 2 * OffsetY - R * 2 * 3) / 2; createCirclePoint(X, Y); bindEvent(canvas, cxt); //CW=2*offsetX+R*2*3+2*X Draw(cxt, circleArr, [],null); } function Draw(cxt, circleArr, pwdArr,touchPoint) { if (pwdArr.length > 0) { cxt.beginPath(); for (var i = 0; i < pwdArr.length; i++) { var pointIndex = pwdArr[i]; cxt.lineTo(circleArr[pointIndex].X, circleArr[pointIndex].Y); } cxt.lineWidth = 10; cxt.strokeStyle = "#627eed"; cxt.stroke(); cxt.closePath(); if(touchPoint!=null){ var lastPointIndex=pwdArr[pwdArr.length-1]; var lastPoint=circleArr[lastPointIndex]; cxt.beginPath(); cxt.moveTo(lastPoint.X,lastPoint.Y); cxt.lineTo(touchPoint.X,touchPoint.Y); cxt.stroke(); cxt.closePath(); } } for (var i = 0; i < circleArr.length; i++) { var Point = circleArr[i]; cxt.fillStyle = "#627eed"; cxt.beginPath(); cxt.arc(Point.X, Point.Y, R, 0, Math.PI * 2, true); cxt.closePath(); cxt.fill(); cxt.fillStyle = "#ffffff"; cxt.beginPath(); cxt.arc(Point.X, Point.Y, R - 3, 0, Math.PI * 2, true); cxt.closePath(); cxt.fill(); if(pwdArr.indexOf(i)>=0){ cxt.fillStyle = "#627eed"; cxt.beginPath(); cxt.arc(Point.X, Point.Y, R -16, 0, Math.PI * 2, true); cxt.closePath(); cxt.fill(); } } } /** * 計算選中的密碼 */ function getSelectPwd(touches,pwdArr){ for (var i = 0; i < circleArr.length; i++) { var currentPoint = circleArr[i]; var xdiff = Math.abs(currentPoint.X - touches.pageX); var ydiff = Math.abs(currentPoint.Y - touches.pageY); var dir = Math.pow((xdiff * xdiff + ydiff * ydiff), 0.5); if(dir > R || pwdArr.indexOf(i) >= 0) continue; pwdArr.push(i); break; } } /** * 給畫布綁定事件 */ function bindEvent(canvas, cxt) { var pwdArr = []; canvas.addEventListener("touchstart", function (e) { getSelectPwd(e.touches[0],pwdArr); }, false); canvas.addEventListener("touchmove", function (e) { e.preventDefault(); var touches = e.touches[0]; getSelectPwd(touches,pwdArr); cxt.clearRect(0,0,canvasWidth,canvasHeight); Draw(cxt,circleArr,pwdArr,{X:touches.pageX,Y:touches.pageY}); }, false); canvas.addEventListener("touchend", function (e) { cxt.clearRect(0,0,canvasWidth,canvasHeight); Draw(cxt,circleArr,pwdArr,null); alert("密碼結(jié)果是:"+pwdArr.join("->")); pwdArr=[]; }, false); } </script> </head> <body> <canvas id="lockCanvas"></canvas> </body> </html>
1、js屬于一種解釋性腳本語言;2、在絕大多數(shù)瀏覽器的支持下,js可以在多種平臺下運(yùn)行,擁有著跨平臺特性;3、js屬于一種弱類型腳本語言,對使用的數(shù)據(jù)類型未做出嚴(yán)格的要求,能夠進(jìn)行類型轉(zhuǎn)換,簡單又容易上手;4、js語言安全性高,只能通過瀏覽器實(shí)現(xiàn)信息瀏覽或動態(tài)交互,從而有效地防止數(shù)據(jù)的丟失;5、基于對象的腳本語言,js不僅可以創(chuàng)建對象,也能使用現(xiàn)有的對象。
以上是“js+html5如何實(shí)現(xiàn)手機(jī)九宮格密碼解鎖功能”這篇文章的所有內(nèi)容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內(nèi)容對大家有所幫助,如果還想學(xué)習(xí)更多知識,歡迎關(guān)注億速云行業(yè)資訊頻道!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進(jìn)行舉報,并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。