本文主要包含HTML5教程,HTML5中国,HTML5 中canvas支持触摸屏的签名面板,html5cn,html5资料,html等相关知识,匿名希望在学习及工作中可以帮助到您
1.前言
最近实在是太忙了，从国庆之后辞职，在慢慢的找工作，到现在的这家公司上班大半个月了，太多的心酸泪无以言表，面试过程中，见到的坑货公司是一家又一家，好几家公司自己都只是上一天班就走了，其中有第一天上班就加班到10点的，有一家公司在体育西路那边，太远，第一天回家挤公交也是太累，以前上班都是走路上班的，自己确实不适合挤公交，还有公司面试的时候和你说什么大数据，性能优化什么的，进公司一看，他们就是用的最简单的三层，没有什么设计模式，总之太多心酸，幸运的是现在这家公司还不错，找工作就是要宁缺毋滥。
2.canvcas标签
canvas基础教程：
3.手写签名面板
公司做的是自动化办公OA系统，一些审核的地方需要加入一些手写签名的功能，刚开始做这个也是没有思路，在网上也找了一下资料，后来发现H5有这个canvcas新标签，感到格外是欣喜。于是拿过来试一下，还真可以。
4.页面代码
@{ Layout = null; }5.脚本代码一
/** * 功能：签名canvas面板初始化,为WritingPad.js手写面板js服务。 * 作者：黄金锋 (549387177@qq.com) * 日期：2015-11-15 15:51:01 * 版本：version 1.0 */ (function (window, document, $) { 'use strict'; // Get a regular interval for drawing to the screen window.requestAnimFrame = (function (callback) { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimaitonFrame || function (callback) { window.setTimeout(callback, 1000/60); }; })(); /* * Plugin Constructor */ var pluginName = 'jqSignature', defaults = { lineColor: '#222222', lineWidth: 1, border: '1px dashed #CCFF99', background: '#FFFFFF', width: 500, height: 200, autoFit: false }, canvasFixture = ''; function Signature(element, options) { // DOM elements/objects this.element = element; this.$element = $(this.element); this.canvas = false; this.$canvas = false; this.ctx = false; // Drawing state this.drawing = false; this.currentPos = { x: 0, y: 0 }; this.lastPos = this.currentPos; // Determine plugin settings this._data = this.$element.data(); this.settings = $.extend({}, defaults, options, this._data); // Initialize the plugin this.init(); } Signature.prototype = { // Initialize the signature canvas init: function() { // Set up the canvas this.$canvas = $(canvasFixture).appendTo(this.$element); this.$canvas.attr({ width: this.settings.width, height: this.settings.height }); this.$canvas.css({ boxSizing: 'border-box', width: this.settings.width + 'px', height: this.settings.height + 'px', border: this.settings.border, background: this.settings.background, cursor: 'crosshair' }); // Fit canvas to width of parent if (this.settings.autoFit === true) { this._resizeCanvas(); } this.canvas = this.$canvas[0]; this._resetCanvas(); // Set up mouse events this.$canvas.on('mousedown touchstart', $.proxy(function(e) { this.drawing = true; this.lastPos = this.currentPos = this._getPosition(e); }, this)); this.$canvas.on('mousemove touchmove', $.proxy(function(e) { this.currentPos = this._getPosition(e); }, this)); this.$canvas.on('mouseup touchend', $.proxy(function(e) { this.drawing = false; // Trigger a change event var changedEvent = $.Event('jq.signature.changed'); this.$element.trigger(changedEvent); }, this)); // Prevent document scrolling when touching canvas $(document).on('touchstart touchmove touchend', $.proxy(function(e) { if (e.target === this.canvas) { e.preventDefault(); } }, this)); // Start drawing var that = this; (function drawLoop() { window.requestAnimFrame(drawLoop); that._renderCanvas(); })(); }, // Clear the canvas clearCanvas: function() { this.canvas.width = this.canvas.width; this._resetCanvas(); }, // Get the content of the canvas as a base64 data URL getDataURL: function() { return this.canvas.toDataURL(); }, reLoadData: function () { this.$canvas.remove(); this._data = this.$element.data(); //for (var i in this.settings) { // alert(i+":"+this.settings[i]); //} //this.settings = $.extend({}, defaults, this._data); this.init(); }, // Get the position of the mouse/touch _getPosition: function(event) { var xPos, yPos, rect; rect = this.canvas.getBoundingClientRect(); event = event.originalEvent; // Touch event if (event.type.indexOf('touch') !== -1) { // event.constructor === TouchEvent xPos = event.touches[0].clientX - rect.left; yPos = event.touches[0].clientY - rect.top; } // Mouse event else { xPos = event.clientX - rect.left; yPos = event.clientY - rect.top; } return { x: xPos, y: yPos }; }, // Render the signature to the canvas _renderCanvas: function() { if (this.drawing) { this.ctx.moveTo(this.lastPos.x, this.lastPos.y); this.ctx.lineTo(this.currentPos.x, this.currentPos.y); this.ctx.stroke(); this.lastPos = this.currentPos; } }, // Reset the canvas context _resetCanvas: function() { this.ctx = this.canvas.getContext("2d"); this.ctx.strokeStyle = this.settings.lineColor; this.ctx.lineWidth = this.settings.lineWidth; }, // Resize the canvas element _resizeCanvas: function() { var width = this.$element.outerWidth(); this.$canvas.attr('width', width); this.$canvas.css('width', width + 'px'); } }; /* * Plugin wrapper and initialization */ $.fn[pluginName] = function ( options ) { var args = arguments; if (options === undefined || typeof options === 'object') { return this.each(function () { if (!$.data(this, 'plugin_' + pluginName)) { $.data(this, 'plugin_' + pluginName, n