{"id":4,"date":"2006-05-18T12:43:54","date_gmt":"2006-05-18T10:43:54","guid":{"rendered":"https:\/\/omatech.com\/omabloc\/2006\/05\/18\/ie-javascript-i-els-memory-leaks\/"},"modified":"2016-10-18T00:10:37","modified_gmt":"2016-10-17T22:10:37","slug":"ie-javascript-i-els-memory-leaks","status":"publish","type":"post","link":"https:\/\/www.omatech.com\/blog\/2006\/05\/18\/ie-javascript-i-els-memory-leaks\/","title":{"rendered":"IE, Javascript i els memory leaks"},"content":{"rendered":"

De vegades, en el desenvolupament d’una web, ens podem trobar amb misteris estranyament resolubles. La resoluci\u00f3 dels problemes est\u00e0 lligada a la consci\u00e8ncia de la seva exist\u00e8ncia i tot plegat pot esdevenir en hores d’investigaci\u00f3 perdudes… o no.<\/p>\n

Aquest \u00e9s justament el cas amb que ens vam trobar en un darrer desenvolupament. La navegaci\u00f3 per la web era fluida amb Firefox i Internet Explorer, per\u00f2 passava a ser excessivament lenta en el segon despr\u00e9s d’algunes interaccions.<\/p>\n

Despr\u00e9s de diverses proves, vaig trobar quelcom interessant a IE: Where’s my memory?<\/a>. Segons sembla, Internet Explorer no manega correctament els closures<\/em> a Javascript de forma que el garbage collector<\/em> autom\u00e0tic emprat per l’ECMAScript no funciona com cal al navegador de Microsoft. Podem trobar una bona explicaci\u00f3 de qu\u00e8 \u00e9s un closure<\/em> a IE: Where’s my memory?<\/a> o a Javascript Closures<\/a>.<\/p>\n

Un cop dutes a terme les diferents solucions proposades a ambd\u00f3s llocs, la navegaci\u00f3 era lleugerament m\u00e9s fluida, per\u00f2 el problema seguia existint. Qu\u00e8 podia ser llavors? Finalment, a for\u00e7a del que es podria considerar com isolate-your-code-developing<\/em>, vaig donar amb el problema i, com passa sovint, resultava ser menys important del que podr\u00edem pensar (ai, ara \u00e9s f\u00e0cil dir-ho…). A la web s’emprava un javascript amb un tag d’inici com ara aquest:<\/p>\n

<script language=\"javascript\"><\/code><\/pre>\n
En canvi, segons les especificacions de l’W3C<\/a> l’atribut language<\/em> est\u00e0 en des\u00fas i, en el seu lloc, insten a utilitzar l’atribut type<\/em> que, d’altra banda, \u00e9s obligatori. Aix\u00ed, el tag d’inici correcte \u00abm\u00ednim\u00bb hauria de ser <\/p>\n
<script type=\"text\/javascript\"><\/code><\/pre>\n
Aquest canvi resol, finalment, el problema plantejat.<\/p>\n
Aquest \u00e9s un bon exemple de com un error aparentment simple pot provocar m\u00e9s d’un maldecap, de la import\u00e0ncia de seguir les especificacions i els est\u00e0ndards, i de com, en la resoluci\u00f3 d’un problema, hom pot aprendre coses que, en principi, no sempre han de estar relacionades amb ell.<\/p>\n","protected":false},"excerpt":{"rendered":"
De vegades, en el desenvolupament d’una web, ens podem trobar amb misteris estranyament resolubles. La resoluci\u00f3 dels problemes est\u00e0 lligada a la consci\u00e8ncia de la seva exist\u00e8ncia i tot plegat pot esdevenir en hores d’investigaci\u00f3 perdudes… o no. Aquest \u00e9s justament el cas amb que ens vam trobar en un darrer desenvolupament. La navegaci\u00f3 per<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-4","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-omatech"},"yoast_head":"\nIE, Javascript i els memory leaks - El blog de Omatech<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.omatech.com\/blog\/2006\/05\/18\/ie-javascript-i-els-memory-leaks\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"IE, Javascript i els memory leaks - El blog de Omatech\" \/>\n<meta property=\"og:description\" content=\"De vegades, en el desenvolupament d’una web, ens podem trobar amb misteris estranyament resolubles. 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