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Possible Duplicate:
run function when page is loaded
我体内有一个脚本，一个相对较长的脚本，我想将其放入一个单独的 .js 文件中，然后在主体加载时调用该函数，而不是将脚本放在主体中，但我没有知道怎么调用它。帮忙？
脚本:
<script type="text/javascript">
// 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("#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 = -1;
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>