嘿UX Designer学习代码，请原谅我的无知和蹩脚的代码。
我有一个CSS动画类型覆盖了一个Hero Image，它也有一个JS效果应用于它。
最初我无法将两个图像都渲染出来。该类型将呈现，但您无法看到它背后的英雄形象，或者英雄形象会出现，但您无法看到类型。
起初我认为是某些类应用于在英雄图像上创建不透明背景的类型，但我通过选择性地评论出来的东西来消除这种可能性。
然后我意识到我需要将类型div放在Hero Image div中。我以前做过这个，但我再试一次，它有效！但它起作用的原因是因为我只是有选择地注释掉了应用于Hero Image的Javascript效果。
所以问题必须是倾斜效果（javascript效果）类。但是我对Javascript知之甚少，所以我不确定导致这个问题的原因。
我猜它与javascript在页面上操作东西的方式有关？我之前有一个类似的问题，当时我有一个带有页脚的页面和一个由JS驱动的响应式图库。 html页脚将呈现，然后JS库将重新定位页面上的所有对象。所以我想在这里发生类似的事情，也许吧？
这是代码的JSFiddle：http://jsfiddle.net/thedonquixotic/8vv7t1as/2/
Tilt FX的东西是JS部分的第二部分代码，为了便于查找，我将其标记为。
HTML的相关部分如下：
<!--Hero image with tilt effect-->
<div class="hero">
<div class="hero__imgwrap">
<!--<div class="grid__item">
<a class="link link--kumya" href="About.html"><span data-letters="David French">David French</span></a>
</div>-->
<img class="hero__img tilt-effect" data-tilt-options='{ "opacity" : 0.3, "extraImgs" : 3, "movement": { "perspective" : 1700, "translateX" : -7, "translateY" : -7, "rotateX" : -7, "rotateY" : -7 } }' src="https://cdn.tutsplus.com/craft/uploads/2013/11/14-snowflakes-lay-paper-copy.jpg" alt="Welcome!" />
</div>
</div>
<!--Hero image with tilt effect-->
这里还有Javascript：
/**
* tiltfx.js
* http://www.codrops.com
*
* Licensed under the MIT license.
* http://www.opensource.org/licenses/mit-license.php
*
* Copyright 2015, Codrops
* http://www.codrops.com
*/
;(function(window) {
'use strict';
/**
* **************************************************************************
* utils
* **************************************************************************
*/
// from https://gist.github.com/desandro/1866474
var lastTime = 0;
var prefixes = 'webkit moz ms o'.split(' ');
// get unprefixed rAF and cAF, if present
var requestAnimationFrame = window.requestAnimationFrame;
var cancelAnimationFrame = window.cancelAnimationFrame;
// loop through vendor prefixes and get prefixed rAF and cAF
var prefix;
for( var i = 0; i < prefixes.length; i++ ) {
if ( requestAnimationFrame && cancelAnimationFrame ) {
break;
}
prefix = prefixes[i];
requestAnimationFrame = requestAnimationFrame || window[ prefix + 'RequestAnimationFrame' ];
cancelAnimationFrame = cancelAnimationFrame || window[ prefix + 'CancelAnimationFrame' ] ||
window[ prefix + 'CancelRequestAnimationFrame' ];
}
// fallback to setTimeout and clearTimeout if either request/cancel is not supported
if ( !requestAnimationFrame || !cancelAnimationFrame ) {
requestAnimationFrame = function( callback, element ) {
var currTime = new Date().getTime();
var timeToCall = Math.max( 0, 16 - ( currTime - lastTime ) );
var id = window.setTimeout( function() {
callback( currTime + timeToCall );
}, timeToCall );
lastTime = currTime + timeToCall;
return id;
};
cancelAnimationFrame = function( id ) {
window.clearTimeout( id );
};
}
function extend( a, b ) {
for( var key in b ) {
if( b.hasOwnProperty( key ) ) {
a[key] = b[key];
}
}
return a;
}
// from http://www.quirksmode.org/js/events_properties.html#position
function getMousePos(e) {
var posx = 0;
var posy = 0;
if (!e) var e = window.event;
if (e.pageX || e.pageY) {
posx = e.pageX;
posy = e.pageY;
}
else if (e.clientX || e.clientY) {
posx = e.clientX + document.body.scrollLeft
+ document.documentElement.scrollLeft;
posy = e.clientY + document.body.scrollTop
+ document.documentElement.scrollTop;
}
return {
x : posx,
y : posy
}
}
// from http://www.sberry.me/articles/javascript-event-throttling-debouncing
function throttle(fn, delay) {
var allowSample = true;
return function(e) {
if (allowSample) {
allowSample = false;
setTimeout(function() { allowSample = true; }, delay);
fn(e);
}
};
}
/***************************************************************************/
/**
* TiltFx fn
*/
function TiltFx(el, options) {
this.el = el;
this.options = extend( {}, this.options );
extend( this.options, options );
this._init();
this._initEvents();
}
/**
* TiltFx options.
*/
TiltFx.prototype.options = {
// number of extra image elements (div with background-image) to add to the DOM - min:1, max:5 (for a higher number, it's recommended to remove the transitions of .tilt__front in the stylesheet.
extraImgs : 2,
// the opacity value for all the image elements.
opacity : 0.7,
// by default the first layer does not move.
bgfixed : true,
// image element's movement configuration
movement : {
perspective : 1000, // perspective value
translateX : -10, // a relative movement of -10px to 10px on the x-axis (setting a negative value reverses the direction)
translateY : -10, // a relative movement of -10px to 10px on the y-axis
translateZ : 20, // a relative movement of -20px to 20px on the z-axis (perspective value must be set). Also, this specific translation is done when the mouse moves vertically.
rotateX : 2, // a relative rotation of -2deg to 2deg on the x-axis (perspective value must be set)
rotateY : 2, // a relative rotation of -2deg to 2deg on the y-axis (perspective value must be set)
rotateZ : 0 // z-axis rotation; by default there's no rotation on the z-axis (perspective value must be set)
}
}
/**
* Initialize: build the necessary structure for the image elements and replace it with the HTML img element.
*/
TiltFx.prototype._init = function() {
this.tiltWrapper = document.createElement('div');
this.tiltWrapper.className = 'tilt';
// main image element.
this.tiltImgBack = document.createElement('div');
this.tiltImgBack.className = 'tilt__back';
this.tiltImgBack.style.backgroundImage = 'url(' + this.el.src + ')';
this.tiltWrapper.appendChild(this.tiltImgBack);
// image elements limit.
if( this.options.extraImgs < 1 ) {
this.options.extraImgs = 1;
}
else if( this.options.extraImgs > 5 ) {
this.options.extraImgs = 5;
}
if( !this.options.movement.perspective ) {
this.options.movement.perspective = 0;
}
// add the extra image elements.
this.imgElems = [];
for(var i = 0; i < this.options.extraImgs; ++i) {
var el = document.createElement('div');
el.className = 'tilt__front';
el.style.backgroundImage = 'url(' + this.el.src + ')';
el.style.opacity = this.options.opacity;
this.tiltWrapper.appendChild(el);
this.imgElems.push(el);
}
if( !this.options.bgfixed ) {
this.imgElems.push(this.tiltImgBack);
++this.options.extraImgs;
}
// add it to the DOM and remove original img element.
this.el.parentNode.insertBefore(this.tiltWrapper, this.el);
this.el.parentNode.removeChild(this.el);
// tiltWrapper properties: width/height/left/top
this.view = { width : this.tiltWrapper.offsetWidth, height : this.tiltWrapper.offsetHeight };
};
/**
* Initialize the events on the main wrapper.
*/
TiltFx.prototype._initEvents = function() {
var self = this,
moveOpts = self.options.movement;
// mousemove event..
this.tiltWrapper.addEventListener('mousemove', function(ev) {
requestAnimationFrame(function() {
// mouse position relative to the document.
var mousepos = getMousePos(ev),
// document scrolls.
docScrolls = {left : document.body.scrollLeft + document.documentElement.scrollLeft, top : document.body.scrollTop + document.documentElement.scrollTop},
bounds = self.tiltWrapper.getBoundingClientRect(),
// mouse position relative to the main element (tiltWrapper).
relmousepos = {
x : mousepos.x - bounds.left - docScrolls.left,
y : mousepos.y - bounds.top - docScrolls.top
};
// configure the movement for each image element.
for(var i = 0, len = self.imgElems.length; i < len; ++i) {
var el = self.imgElems[i],
rotX = moveOpts.rotateX ? 2 * ((i+1)*moveOpts.rotateX/self.options.extraImgs) / self.view.height * relmousepos.y - ((i+1)*moveOpts.rotateX/self.options.extraImgs) : 0,
rotY = moveOpts.rotateY ? 2 * ((i+1)*moveOpts.rotateY/self.options.extraImgs) / self.view.width * relmousepos.x - ((i+1)*moveOpts.rotateY/self.options.extraImgs) : 0,
rotZ = moveOpts.rotateZ ? 2 * ((i+1)*moveOpts.rotateZ/self.options.extraImgs) / self.view.width * relmousepos.x - ((i+1)*moveOpts.rotateZ/self.options.extraImgs) : 0,
transX = moveOpts.translateX ? 2 * ((i+1)*moveOpts.translateX/self.options.extraImgs) / self.view.width * relmousepos.x - ((i+1)*moveOpts.translateX/self.options.extraImgs) : 0,
transY = moveOpts.translateY ? 2 * ((i+1)*moveOpts.translateY/self.options.extraImgs) / self.view.height * relmousepos.y - ((i+1)*moveOpts.translateY/self.options.extraImgs) : 0,
transZ = moveOpts.translateZ ? 2 * ((i+1)*moveOpts.translateZ/self.options.extraImgs) / self.view.height * relmousepos.y - ((i+1)*moveOpts.translateZ/self.options.extraImgs) : 0;
el.style.WebkitTransform = 'perspective(' + moveOpts.perspective + 'px) translate3d(' + transX + 'px,' + transY + 'px,' + transZ + 'px) rotate3d(1,0,0,' + rotX + 'deg) rotate3d(0,1,0,' + rotY + 'deg) rotate3d(0,0,1,' + rotZ + 'deg)';
el.style.transform = 'perspective(' + moveOpts.perspective + 'px) translate3d(' + transX + 'px,' + transY + 'px,' + transZ + 'px) rotate3d(1,0,0,' + rotX + 'deg) rotate3d(0,1,0,' + rotY + 'deg) rotate3d(0,0,1,' + rotZ + 'deg)';
}
});
});
// reset all when mouse leaves the main wrapper.
/*this.tiltWrapper.addEventListener('mouseleave', function(ev) {
setTimeout(function() {
for(var i = 0, len = self.imgElems.length; i < len; ++i) {
var el = self.imgElems[i];
el.style.WebkitTransform = 'perspective(' + moveOpts.perspective + 'px) translate3d(0,0,0) rotate3d(1,1,1,0deg)';
el.style.transform = 'perspective(' + moveOpts.perspective + 'px) translate3d(0,0,0) rotate3d(1,1,1,0deg)';
}
}, 60);
});*/
// window resize
window.addEventListener('resize', throttle(function(ev) {
// recalculate tiltWrapper properties: width/height/left/top
self.view = { width : self.tiltWrapper.offsetWidth, height : self.tiltWrapper.offsetHeight };
}, 50));
};
function init() {
// search for imgs with the class "tilt-effect"
[].slice.call(document.querySelectorAll('img.tilt-effect')).forEach(function(img) {
new TiltFx(img, JSON.parse(img.getAttribute('data-tilt-options')));
});
}
init();
window.TiltFx = TiltFx;
})(window);
答案 0 :(得分：1)
我希望我理解得很好，所以我创建了一些修改 CSS：
.grid__item {
position: absolute;
left: 50%;
z-index: 1;
display: flex;
justify-content: center;
top: 50%;
}
.link--kumya {
font-family: "Syncopate",sans-serif;
font-size: 6.5em;
overflow: hidden;
color: #242424;
position: relative;
left: -50%;
top: -70px;
text-align: center;
}
更改此部件后，将显示类型和动画背景