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ページにプリロードされているスクリプトで画像を非表示にしようとしています。

以下のスクリプトは、onClick で画像を画面に「雨」のように降らせます。うまく機能しますが、ボタンがクリックされる前に、プリロードされた画像自体がページに表示されます。ボタンが押されるまで画像を非表示にしようとしています。

関数dispensMittens()が実行されるまで画像を非表示にする方法について誰かが洞察を持っている場合、私は永遠に感謝します:)

ありがとう！

<script language="javascript">
var pictureSrc = 'mitten.gif'; //the location of the mittens
var pictureWidth = 40;            //the width of the mittens
var pictureHeight = 46;           //the height of the  mittens
var numFlakes = 10;               //the number of  mittens
var downSpeed = 0.01;          
var lrFlakes = 10;         
var EmergencyMittens = false; 

//safety checks. Browsers will hang if this is wrong. If other values are wrong there will just be errors
if( typeof( numFlakes ) != 'number' || Math.round( numFlakes ) != numFlakes || numFlakes < 1 ) { numFlakes = 10; }

//draw the snowflakes
for( var x = 0; x < numFlakes; x++ ) {
    if( document.layers ) { //releave NS4 bug
        document.write('<layer id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0"></layer>');
    } else {
        document.write('<div style="position:absolute;" id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0"></div>');
    }
}

//calculate initial positions (in portions of browser window size)
var xcoords = new Array(), ycoords = new Array(), snFlkTemp;
for( var x = 0; x < numFlakes; x++ ) {
    xcoords[x] = ( x + 1 ) / ( numFlakes + 1 );
    do { snFlkTemp = Math.round( ( numFlakes - 1 ) * Math.random() );
    } while( typeof( ycoords[snFlkTemp] ) == 'number' );
    ycoords[snFlkTemp] = x / numFlakes;
}

//now animate
function mittensFall() {
    if( !getRefToDivNest('snFlkDiv0') ) { return; }
    var scrWidth = 0, scrHeight = 0, scrollHeight = 0, scrollWidth = 0;
    //find screen settings for all variations. doing this every time allows for resizing and scrolling
    if( typeof( window.innerWidth ) == 'number' ) { scrWidth = window.innerWidth; scrHeight = window.innerHeight; } else {
        if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
            scrWidth = document.documentElement.clientWidth; scrHeight = document.documentElement.clientHeight; } else {
            if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
                scrWidth = document.body.clientWidth; scrHeight = document.body.clientHeight; } } }
    if( typeof( window.pageYOffset ) == 'number' ) { scrollHeight = pageYOffset; scrollWidth = pageXOffset; } else {
        if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) { scrollHeight = document.body.scrollTop; scrollWidth = document.body.scrollLeft; } else {
            if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) { scrollHeight = document.documentElement.scrollTop; scrollWidth = document.documentElement.scrollLeft; } }
    }
    //move the snowflakes to their new position
    for( var x = 0; x < numFlakes; x++ ) {
        if( ycoords[x] * scrHeight > scrHeight - pictureHeight ) { ycoords[x] = 0; }
        var divRef = getRefToDivNest('snFlkDiv'+x); if( !divRef ) { return; }
        if( divRef.style ) { divRef = divRef.style; } var oPix = document.childNodes ? 'px' : 0;
        divRef.top = ( Math.round( ycoords[x] * scrHeight ) + scrollHeight ) + oPix;
        divRef.left = ( Math.round( ( ( xcoords[x] * scrWidth ) - ( pictureWidth / 2 ) ) + ( ( scrWidth / ( ( numFlakes + 1 ) * 4 ) ) * ( Math.sin( lrFlakes * ycoords[x] ) - Math.sin( 3 * lrFlakes * ycoords[x] ) ) ) ) + scrollWidth ) + oPix;
        ycoords[x] += downSpeed;
    }
}

//DHTML handlers
function getRefToDivNest(divName) {
    if( document.layers ) { return document.layers[divName]; } //NS4
    if( document[divName] ) { return document[divName]; } //NS4 also
    if( document.getElementById ) { return document.getElementById(divName); } //DOM (IE5+, NS6+, Mozilla0.9+, Opera)
    if( document.all ) { return document.all[divName]; } //Proprietary DOM - IE4
    return false;
}


function dispenseMittens() {
if (EmergencyMittens) {
 window.clearInterval(EmergencyMittens);

} else {
EmergencyMittens = window.setInterval('mittensFall();',100);
}
}
</script>
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2

ボタンがクリックされるまで画像のスタイルを にdisplay: 'none'設定しておけばdisplay: 'inline-block'、雨が降る前にスタイルを元に戻すことができます。

于 2012-11-15T22:56:29.080 に答える