手机互动网页项目总结

var lib = { _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", decodeArrayBuffer: function(input) { var bytes = (input.length/4) * 3; var ab = new ArrayBuffer(bytes); this.decode(input, ab); return ab; }, decode: function(input, arrayBuffer) { var lkey1 = this._keyStr.indexOf(input.charAt(input.length-1)); var lkey2 = this._keyStr.indexOf(input.charAt(input.length-2)); var bytes = (input.length/4) * 3; if (lkey1 == 64) bytes--; if (lkey2 == 64) bytes--; var uarray; var chr1, chr2, chr3; var enc1, enc2, enc3, enc4; var i = 0; var j = 0; if (arrayBuffer) uarray = new Uint8Array(arrayBuffer); else uarray = new Uint8Array(bytes); input = input.replace(/[^A-Za-z0-9+/=]/g, ""); for (i=0; i<bytes; i+=3) { enc1 = this._keyStr.indexOf(input.charAt(j++)); enc2 = this._keyStr.indexOf(input.charAt(j++)); enc3 = this._keyStr.indexOf(input.charAt(j++)); enc4 = this._keyStr.indexOf(input.charAt(j++)); chr1 = (enc1 << 2) | (enc2 >> 4); chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); chr3 = ((enc3 & 3) << 6) | enc4; uarray[i] = chr1; if (enc3 != 64) uarray[i+1] = chr2; if (enc4 != 64) uarray[i+2] = chr3; } return uarray; }, getScript: function(url, callback, charset){ var head = document.getElementsByTagName("head")[0] || document.documentElement, script = document.createElement("script"); script.src = url; charset && (script.charset = charset); script.onload = script.onreadystatechange = function() { if ((!this.readyState || this.readyState === "loaded" || this.readyState === "complete") ) { callback && callback(); script.onload = script.onreadystatechange = null; if (head && script.parentNode) head.removeChild(script); } }; head.appendChild(script); return script; } } var QAudio = function(config){ this.config = config; this.init(); } QAudio.prototype.init = function(){ var config = this.config; this.src = config.src; this.base64 = config.base64; if (\‘AudioContext\‘ in window) { this.audioContext = new AudioContext(); } else if (\‘webkitAudioContext\‘ in window) { this.audioContext = new webkitAudioContext(); } else { this.audio = document.createElement(\‘audio\‘); this.audio.preload = \‘auto\‘; this.audio.src = this.src; } // base64数据处理 if(this.audioContext) { this._handleBase64(); } this.load(); } QAudio.prototype._handleBase64 = function(){ var self = this; window[this.config.callback] = function(data){ var arrayBuff = lib.decodeArrayBuffer(data); self.audioContext.decodeAudioData(arrayBuff, function(audioData) { self._arrayBuff = audioData; }); } } QAudio.prototype.load = function(){ // 如果支持Web Audio，加载base64音频 if(this.audioContext) { lib.getScript(this.base64); } else if(this.audio) { this.audio.load(); } } QAudio.prototype.play = function(){ if(this.audioContext) { var mySource = this.audioContext.createBufferSource(); mySource.buffer = this._arrayBuff; mySource.connect(this.audioContext.destination); if (\‘AudioContext\‘ in window) { mySource.start(0); } else if (\‘webkitAudioContext\‘ in window) { mySource.noteOn(0); } } else if(this.audio) { this.audio.play(); } }