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                                      1. 当前位置 : IT培训网 > Web前端 > Web教程 > HTML5 Web Workers是如何运行的

                                        HTML5 Web Workers是如何运行的

                                        时间:2015-12-09 15:51:33  来源:web前端培训网  作者:IT培训网  已有:名学员访问该课程
                                        标签(Tag):   html5(196)
                                        好了,看到这里你懂了吗,这些 JavaScript脚本的运行不会影响页面的性能,它只是在后台运行而已,如果你想要学习HTML5 web workers方面的知识,那就赶紧关注IT培训网小编吧!

                                        ZAIHTML5 webYEMIANZHONGYOUZHEIYANGYIXIEGONGNENG,NEIJIUSHIYONGJIAOBUJavaScriptKONGZHIDETEXIAOHUOZHEGONGNENGZAIYUNXINGZHE,ZHEIXIEGONGNENGDEYUNXINGHUIYINGXIANGYEMIANDAKAISUDUMA,HUITUOMANYONGHUDELIULANSUDUMA,XIANGYAOZHIDAODEHUA,GANJINKANXIAMIANBA!

                                        HTML5 Web Workers

                                        天下棋牌下载 web worker SHIYUNXINGZAIHOUTAIDE JavaScript,BUHUIYINGXIANGYEMIANDEXINGNENG。

                                        什么是 Web Worker

                                        DANGZAI HTML YEMIANZHONGZHIXINGJIAOBENSHI,YEMIANDEZHUANGTAISHIBUKEXIANGYINGDE,ZHIDAOJIAOBENYIWANCHENG。

                                        天下棋牌下载 web worker SHIYUNXINGZAIHOUTAIDE JavaScript,DULIYUQITAJIAOBEN,BUHUIYINGXIANGYEMIANDEXINGNENG。NINKEYIJIXUZUORENHEYUANYIZUODESHIQING:DIANJI、XUANQUNEIRONGDENGDENG,ERCISHI web worker ZAIHOUTAIYUNXING。

                                        浏览器支持

                                        HTML5 Web Workers是如何运行的_wescliffe.com

                                        天下棋牌下载 Internet Explorer 10, Firefox, Chrome, Safari HE Opera DOUZHICHIWeb workers.

                                        天下棋牌下载 HTML5 Web Workers SHILI

                                        XIAMIANDELIZICHUANGJIANLEYIGEJIANDANDE web worker,ZAIHOUTAIJISHU:

                                        源代码:

                                        <!DOCTYPE html>

                                        <html>

                                        <head> 

                                        <meta charset="utf-8"> 

                                        <title>IT培训网(wescliffe.com)</title> 

                                        </head>

                                        <body>

                                        <p>计数: <output id="result"></output></p>

                                        <button onclick="startWorker()">开始工作</button>

                                        <button onclick="stopWorker()">停止工作</button>

                                        <p><strong>注意:</strong> Internet Explorer 9 及更早 IE 版本浏览器不支持 Web Workers.</p>

                                        <script>

                                        var w;

                                        function startWorker() {

                                            if(typeof(Worker) !== "undefined") {

                                                if(typeof(w) == "undefined") {

                                                    w = new Worker("demo_workers.js");

                                                }

                                                w.onmessage = function(event) {

                                                    document.getElementById("result").innerHTML = event.data;

                                                };

                                            } else {

                                                document.getElementById("result").innerHTML = "抱歉,你的浏览器不支持 Web Workers...";

                                            }

                                        }

                                        function stopWorker()

                                        {

                                            w.terminate();

                                            w = undefined;

                                        }

                                        </script>

                                        </body>

                                        </html>

                                        运行结果:

                                        HTML5 Web Workers是如何运行的_wescliffe.com

                                        demo_workers.js 文件代码:

                                        var i=0;

                                        天下棋牌下载 function timedCount()

                                        {

                                            i=i+1;

                                            postMessage(i);

                                        天下棋牌下载     setTimeout("timedCount()",500);

                                        }

                                        timedCount();

                                        检测浏览器是否支持 Web Worker

                                        ZAICHUANGJIAN web worker ZHIQIAN,QINGJIANCEYONGHUDELIULANQISHIFOUZHICHITA:

                                        天下棋牌下载 if(typeof(Worker)!=="undefined")

                                        {

                                            // SHIDE! Web worker ZHICHI!

                                            // YIXIEDAIMA.....

                                        }

                                        else

                                        {

                                            //BAOQIAN! Web Worker BUZHICHI

                                        }

                                        创建 web worker 文件

                                        天下棋牌下载 XIANZAI,RANGWOMENZAIYIGEWAIBU JavaScript ZHONGCHUANGJIANWOMENDE web worker。

                                        ZAIZHEILI,WOMENCHUANGJIANLEJISHUJIAOBEN。GAIJIAOBENCUNCHUYU "demo_workers.js" WENJIANZHONG:

                                        天下棋牌下载 var i=0;

                                        function timedCount()

                                        {

                                            i=i+1;

                                        天下棋牌下载     postMessage(i);

                                        天下棋牌下载     setTimeout("timedCount()",500);

                                        }

                                        timedCount();

                                        YISHANGDAIMAZHONGZHONGYAODEBUFENSHI postMessage() FANGFA - TAYONGYUXIANG HTML YEMIANCHUANHUIYIDUANXIAOXI。

                                        天下棋牌下载 ZHUYI: web worker TONGCHANGBUYONGYURUCIJIANDANDEJIAOBEN,ERSHIYONGYUGENGHAOFEI CPU ZIYUANDERENWU。

                                        CHUANGJIAN Web Worker DUIXIANG

                                        WOMENYIJINGYOULE web worker WENJIAN,XIANZAIWOMENXUYAOCONG HTML YEMIANDIAOYONGTA。

                                        XIAMIANDEDAIMAJIANCESHIFOUCUNZAI worker,RUGUOBUCUNZAI,- TAHUICHUANGJIANYIGEXINDE web worker DUIXIANG,RANHOUYUNXING "demo_workers.js" ZHONGDEDAIMA:

                                        if(typeof(w)=="undefined")

                                        {

                                        天下棋牌下载     w=new Worker("demo_workers.js");

                                        }

                                        天下棋牌下载 RANHOUWOMENJIUKEYICONG web worker FASHENGHEJIESHOUXIAOXILE。

                                        天下棋牌下载 XIANG web worker TIANJIAYIGE "onmessage" SHIJIANJIANTINGQI:

                                        天下棋牌下载 w.onmessage=function(event){

                                            document.getElementById("result").innerHTML=event.data;

                                        };

                                        终止 Web Worker

                                        DANGWOMENCHUANGJIAN web worker DUIXIANGHOU,TAHUIJIXUJIANTINGXIAOXI(JISHIZAIWAIBUJIAOBENWANCHENGZHIHOU)ZHIDAOQIBEIZHONGZHIWEIZHI。

                                        RUXUZHONGZHI web worker,BINGSHIFANGLIULANQI/JISUANJIZIYUAN,QINGSHIYONG terminate() FANGFA:

                                        w.terminate();

                                        完整的 Web Worker 实例代码

                                        WOMENYIJINGKANDAOLE .js WENJIANZHONGDE Worker DAIMA。XIAMIANSHI HTML YEMIANDEDAIMA:

                                        实例

                                        <!DOCTYPE html>

                                        <html>

                                        <head>

                                        <meta charset="utf-8">

                                        <title>IT培训网(wescliffe.com)</title>

                                        </head>

                                        <body>

                                        <p>计数: <output id="result"></output></p>

                                        <button onclick="startWorker()">开始工作</button>

                                        <button onclick="stopWorker()">停止工作</button>

                                        <p><strong>注意:</strong> Internet Explorer 9 及更早 IE 版本浏览器不支持 Web Workers.</p>

                                        <script>

                                        var w;

                                        function startWorker() {

                                        if(typeof(Worker) !== "undefined") {

                                        if(typeof(w) == "undefined") {

                                        w = new Worker("demo_workers.js");

                                        }

                                        w.onmessage = function(event) {

                                        document.getElementById("result").innerHTML = event.data;

                                        };

                                        } else {

                                        document.getElementById("result").innerHTML = "抱歉,你的浏览器不支持 Web Workers...";

                                        }

                                        }

                                        function stopWorker()

                                        {

                                        w.terminate();

                                        w = undefined;

                                        }

                                        </script>

                                        </body>

                                        </html>

                                        运行结果:

                                        HTML5 Web Workers是如何运行的_wescliffe.com

                                        Web Workers DOM

                                        天下棋牌下载 YOUYU web worker WEIYUWAIBUWENJIANZHONG,TAMENWUFAFANGWENXIALI JavaScript DUIXIANG:

                                        window DUIXIANG

                                        天下棋牌下载 document DUIXIANG

                                        天下棋牌下载 parent DUIXIANG

                                        HAOLE,KANDAOZHEILINIDONGLEMA,ZHEIXIEJIAOBENDEYUNXINGBUHUIYINGXIANGYEMIANDEXINGNENG,TAZHISHIZAIHOUTAIYUNXINGERYI,RUGUONIXIANGYAOXUEXIHTML5 web workersFANGMIANDEZHISHI,NEIJIUGANJINGUANZHUITPEIXUNWANGXIAOBIANBA!

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                                        Web 教程
                                        1、HTML 教程
                                        1.1 HTML 简介
                                        1.2 HTML 编辑器
                                        1.3 HTML 基础
                                        1.4 HTML 元素
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                                        1.6 HTML 标题
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                                        1.24 HTML URL
                                        1.25 HTML 速查列表
                                        1.26 HTML 总结
                                        1.27 HTML 简介
                                        2、HTML5
                                        2.1 HTML5 教程
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                                        2.3 HTML5 新元素
                                        2.4 HTML5 Canvas
                                        2.5 HTML5 内联 SVG
                                        2.6 HTML5 MathML
                                        2.7 HTML5 拖放
                                        2.8 HTML5 地理定位
                                        2.9 HTML5 Video(视频)
                                        2.10 HTML5 Audio(音频)
                                        2.11 HTML5 Input 类型
                                        2.12 HTML5 表单元素
                                        2.13 HTML5 表单属性
                                        2.14 HTML5 语义元素
                                        2.15 HTML5 Web 存储
                                        2.16 HTML5 Web SQL
                                        2.17 HTML5 应用程序缓存
                                        2.18 HTML5 Web Workers
                                        2.19 HTML5 SSE
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                                        3、HTML 媒体
                                        3.1 HTML 媒体(Media)
                                        3.2 HTML 插件
                                        3.3 HTML 音频(Audio)
                                        3.4 HTML视频(Videos)播放

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