[js] javascript sleep

看板Ajax作者TonyQ (骨頭)時間17年前 (2007/09/20 03:37)推噓2(2推 0噓 2→)

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嗯我要說的是sleep (ms) 讓執行緒休息並鎖定一陣子的code (同步模式) 一般來講常見都是寫while(true)吧或者是弄成window.setTimeout() while(true)真的是不用考慮了，穩操爆browser，除非你要停的時間很短。隨便跑都佔掉80% cpu起跳... 可是 setTimeout() 不是同步的，所以要用比較複雜的方式達到同步鎖定的，我在這點上腦袋打結了兩天，還沒有想到一個比較好的方式。:P 剛剛看到一個賤招 , 據說是IE only (我只是看說明這樣寫, 沒用過model對話盒...XD) 不過有效的能有效的同步鎖住資料，也是利用setTimeout() 算是蠻有效解決我的問題，post過來分享看看，並詢問一下各位同好有沒有更好的作法。:P 原碼我看到的地方是 http://www.ozzu.com/ftopic66049.html ──────────────────────────────── /** *@description pause( iMilliseconds ) Cause the single Javascript thread to hald/pause/sleep/wait for a specified period of time, by opening in modalDialog window (IE only) that modally locks the browser until it returns. This modal dialog is not opened to any page, but uses the Javascript: protocol to execute a javascript setTimeout. In this modal context the setTimeout, has the desired affect of preventing any other script execution. The sole purpose of the timeout execution script is to close the modal dialog which will return control/unluck the browser. The intention was to find a way to allow the UI to be updated and rendered in the middle of function/method without the need to split the method up, remove nested calls, or use closures. Used in this fashion to update the UI, a 0 (zero) is usually passed (or optionally omitted altogether) so that the only delay is for the UI to render. *@version Note Please be aware that the user interface WILL update its rendering (if you've made and DOM/CSS/Text changes they will appear) and this may significantly slow down program execution if looping. *@keywords pause sleep wait halt javascript show modal dialog set timeout multi-threaded single thread *@version 1.2 * @param {Object} iMilliseconds [optional] the number of milliseconds the code will pause before returning - If no value is passed the code will returned immediately (as if a 0 were passed) * @return undefined there is no return value from this function */ function pause( iMilliseconds ) { var sDialogScript = 'window.setTimeout( function () { window.close(); }, ' + iMilliseconds + ');'; window.showModalDialog( 'javascript:document.writeln ("<script>' + sDialogScript + '<' + '/script>")'); } -- 　▄▅▆▇███▇▆▅▄▃　　　　　　　　╰┼╯─╮ ╮　　　　　　　◥███████████◣　　　　　　　╰┼╯＝│=│　　　　　　　　 ◥██████───────◣　　　　＊．　╯　 ╯ ╯ の　物　語　．＊　◥███████──────◣　～　◢◣　　　　　　　　　　　　 ◢◣ 　◥██████───────◤　　　◥◤＊　　空白的世界．翼＊◥◤ 　◥██▁▂▃▄▅▆▇███▆▅▄▃▂▂～telnet://tony1223.no-ip.info -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 125.232.16.81 ※ 編輯: TonyQ 來自: 125.232.16.81 (09/20 03:37)