string(14) "127.0.0.1:9200"
URL: http://127.0.0.1:9200/likecs_art_db/_search<br>REQUEST:<pre>Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => js事件循环
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 0
)
</pre>RESPONSE:<pre>string(7336) "{"took":11,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":28.612135,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"83503","_score":28.612135,"_source":{"id":"83503","text":"js\u4e8b\u4ef6\u5faa\u73af","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        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</pre>string(14) "127.0.0.1:9200"
URL: http://127.0.0.1:9200/likecs_art_db/_search<br>REQUEST:<pre>Array
(
    [query] => Array
        (
            [match] => Array
                (
                    [text] => Array
                        (
                            [query] => js事件循环
                        )

                )

        )

    [highlight] => Array
        (
            [fields] => Array
                (
                    [text] => stdClass Object
                        (
                        )

                )

            [pre_tags] => #em#
            [post_tags] => #/em#
        )

    [size] => 8
    [from] => 8
)
</pre>RESPONSE:<pre>string(7405) "{"took":12,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":10000,"relation":"gte"},"max_score":28.612135,"hits":[{"_index":"likecs_art_db","_type":"_doc","_id":"73394","_score":23.507778,"_source":{"id":"73394","text":"Event Loop js \u4e8b\u4ef6\u5faa\u73af\u521d\u7406\u89e3","intro":"\u76ee\u5f55\n\nECharts\n\u5f02\u6b65\u52a0\u8f7d\n\n\n\nECharts\r\n\u6570\u636e\u53ef\u89c6\u5316\u5728\u8fc7\u53bb\u51e0\u5e74\u4e2d\u53d6\u5f97\u4e86\u5de8\u5927\u8fdb\u5c55\u3002\u5f00\u53d1\u4eba\u5458\u5bf9\u53ef\u89c6\u5316\u4ea7\u54c1\u7684\u671f\u671b\u4e0d\u518d\u662f\u7b80\u5355\u7684\u56fe\u8868\u521b\u5efa\u5de5\u5177\uff0c\u800c\u662f\u5728\u4ea4\u4e92\u3001\u6027\u80fd\u3001\u6570\u636e\u5904\u7406\u7b49\u65b9\u9762\u6709\u66f4\u9ad8\u7684\u8981\u6c42\u3002\r\nchart.setOption({\r\n    color: [\r\n        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                        <h1 class="page-title"><a href="/show-83503.html" title="js事件循环">js事件循环</a></h1>
            
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            <footer class="tc"> yuanlichao 
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    <p><strong><span style="font-size: 18px;">先了解以下这戏概念性的东西</span></strong></p>
<div>1、<strong>单线程</strong>     ：一个任务执行后再执行另一个任务  </div>
<div> </div>
<div>     <strong>多线程</strong>     ：同时处理多个任务</div>
<div> </div>
<div>2、<strong>同步任务（阻塞）</strong>    ：在主线程上排队执行的任务，只有前一个任务执行完毕，才能执行后一个任务；</div>
<div> </div>
<div>　 <strong> 异步任务（非阻塞）</strong>：不进入主线程、而进入"任务队列"的任务，只有"任务队列"通知主线程，某个异步任务可以执行了，该任务才会进入主线程执行。</div>
<div> </div>
<div>
<div><strong> js为什么选择单线程？</strong></div>
<div>　　　　如果两个线程同时操作同一个dom肯定会发生冲突，而单线程完美的避免了这个问题。打个比方：一家公司有两个老板，a老板让员工往东，而b老板让员工往西，这时员工不知道该听哪个老板的，净剩下两个老板吵架了。而单线程就像是一个公司只有一个老板，他让往东就往东，往西就往西，不会有冲突</div>
 </div>
<div><strong>为什么要异步？</strong></div>
<div>　　　　如果单线程同步的话，像三十秒后关闭广告这种操作，这三十秒期间无法进行任何操作，因为线程一直在等待他的执行结果，等它执行完了才能继续下面的操作</div>
<div> </div>
<div><span style="font-size: 18px;"><strong>js事件循环就是以上问题的解决方案</strong></span></div>
<div>　　　　
<div>　　1、所有同步任务都在主线程上执行，形成一个执行栈。</div>
<div>　　2、主线程之外，还存在一个"任务队列"。只要异步任务有了运行结果，就在"任务队列"之中放置一个任务。</div>
<div>　　3、一旦"执行栈"中的所有同步任务执行完毕，系统会从任务列队中，将有结果的任务放入主线程执行</div>
<div>　　4、主线程不断重复上面的第三步。</div>
<div> </div>
<div><span style="font-size: 18px;"><strong>白话总结：</strong></span></div>
<div>　　先把电饭锅插上就不管了，等我的菜炒完了再回来看看大米饭熟没熟</div>
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