Discussion :

[Jean-Georges]

Bonsoir,
J'ai voulu intégrer de la neige sur un site web et j'ai trouvé ce script qui fonctionne bien mais provoque un leak de mémoire qui éssoufle rapidement un pc modeste :http://rainbow.arch.scriptmania.com/...ow_fall_1.html

En regardant le code, je ne vois pas ce qui provoque l'augmentation de consommation mais javascript n'est pas un langage que je connais très bien (je maîtrise assez bien jQuery mais cela fait longtemps que je n'ai pas codé sans lui).
Peut-être que cela paraîtra évident à l'un d'entre vous ?
Merci d'avance :

Code :

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<SCRIPT type="text/javascript">
/*
Snow Fall 1 - no images - Java Script
Visit http://rainbow.arch.scriptmania.com/scripts/
  for this script and many more
*/
 
// Set the number of snowflakes (more than 30 - 40 not recommended)
var snowmax=35
 
// Set the colors for the snow. Add as many colors as you like
var snowcolor=new Array("#aaaacc","#ddddff","#ccccdd","#f3f3f3","#f0ffff")
 
// Set the fonts, that create the snowflakes. Add as many fonts as you like
var snowtype=new Array("Times","Arial","Times","Verdana")
 
// Set the letter that creates your snowflake (recommended: * )
var snowletter="*"
 
// Set the speed of sinking (recommended values range from 0.3 to 2)
var sinkspeed=0.6
 
// Set the maximum-size of your snowflakes
var snowmaxsize=30
 
// Set the minimal-size of your snowflakes
var snowminsize=8
 
// Set the snowing-zone
// Set 1 for all-over-snowing, set 2 for left-side-snowing
// Set 3 for center-snowing, set 4 for right-side-snowing
var snowingzone=1
 
///////////////////////////////////////////////////////////////////////////
// CONFIGURATION ENDS HERE
///////////////////////////////////////////////////////////////////////////
 
 
// Do not edit below this line
var snow=new Array()
var marginbottom
var marginright
var timer
var i_snow=0
var x_mv=new Array();
var crds=new Array();
var lftrght=new Array();
var browserinfos=navigator.userAgent
var ie5=document.all&&document.getElementById&&!browserinfos.match(/Opera/)
var ns6=document.getElementById&&!document.all
var opera=browserinfos.match(/Opera/)
var browserok=ie5||ns6||opera
 
function randommaker(range) {
        rand=Math.floor(range*Math.random())
    return rand
}
 
function initsnow() {
        if (ie5 || opera) {
                marginbottom = document.body.scrollHeight
                marginright = document.body.clientWidth-15
        }
        else if (ns6) {
                marginbottom = document.body.scrollHeight
                marginright = window.innerWidth-15
        }
        var snowsizerange=snowmaxsize-snowminsize
        for (i=0;i<=snowmax;i++) {
                crds[i] = 0;
            lftrght[i] = Math.random()*15;
            x_mv[i] = 0.03 + Math.random()/10;
                snow[i]=document.getElementById("s"+i)
                snow[i].style.fontFamily=snowtype[randommaker(snowtype.length)]
                snow[i].size=randommaker(snowsizerange)+snowminsize
                snow[i].style.fontSize=snow[i].size+'px';
                snow[i].style.color=snowcolor[randommaker(snowcolor.length)]
                snow[i].style.zIndex=1000
                snow[i].sink=sinkspeed*snow[i].size/5
                if (snowingzone==1) {snow[i].posx=randommaker(marginright-snow[i].size)}
                if (snowingzone==2) {snow[i].posx=randommaker(marginright/2-snow[i].size)}
                if (snowingzone==3) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}
                if (snowingzone==4) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}
                snow[i].posy=randommaker(2*marginbottom-marginbottom-2*snow[i].size)
                snow[i].style.left=snow[i].posx+'px';
                snow[i].style.top=snow[i].posy+'px';
        }
        movesnow()
}
 
function movesnow() {
        for (i=0;i<=snowmax;i++) {
                crds[i] += x_mv[i];
                snow[i].posy+=snow[i].sink
                snow[i].style.left=snow[i].posx+lftrght[i]*Math.sin(crds[i])+'px';
                snow[i].style.top=snow[i].posy+'px';
 
                if (snow[i].posy>=marginbottom-2*snow[i].size || parseInt(snow[i].style.left)>(marginright-3*lftrght[i])){
                        if (snowingzone==1) {snow[i].posx=randommaker(marginright-snow[i].size)}
                        if (snowingzone==2) {snow[i].posx=randommaker(marginright/2-snow[i].size)}
                        if (snowingzone==3) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/4}
                        if (snowingzone==4) {snow[i].posx=randommaker(marginright/2-snow[i].size)+marginright/2}
                        snow[i].posy=0
                }
        }
        var timer=setTimeout("movesnow()",50)
}
 
for (i=0;i<=snowmax;i++) {
        document.write("<span id='s"+i+"' style='position:absolute;top:-"+snowmaxsize+"'>"+snowletter+"</span>")
}
if (browserok) {
        window.onload=initsnow
}
 
</SCRIPT>