我正在使用Raphael JS库并尝试创建一个可应用于任何目标的hoverIn和hoverOut函数。
我认为问题是缺少传递引用的功能（我对JavaScript很新）。
在创建一组路径并添加属性以查看它们之后：
Services = rsr.set();
Services.push(
rsr.path("M698.5,98.617V96.09c0.289,0.256,0.636,0.484,1.04,0.689 c0.403,0.203,0.829,0.375,1.276,0.516c0.445,0.143,0.896,0.25,1.347,0.326c0.45,0.078,0.867,0.113,1.251,0.113 c1.318,0,2.305-0.242,2.955-0.732s0.977-1.193,0.977-2.111c0-0.496-0.106-0.922-0.325-1.291c-0.217-0.365-0.517-0.699-0.898-1.002 c-0.383-0.301-0.836-0.592-1.359-0.865c-0.521-0.275-1.088-0.568-1.689-0.875c-0.64-0.32-1.235-0.648-1.788-0.982 c-0.555-0.33-1.033-0.697-1.442-1.098c-0.408-0.398-0.729-0.854-0.964-1.359c-0.235-0.504-0.351-1.1-0.351-1.781 c0-0.834,0.184-1.561,0.549-2.178c0.366-0.615,0.846-1.125,1.442-1.525c0.596-0.398,1.273-0.697,2.036-0.893 c0.761-0.197,1.537-0.295,2.328-0.295c1.804,0,3.119,0.219,3.943,0.65v2.412c-1.082-0.748-2.468-1.123-4.161-1.123 c-0.468,0-0.938,0.051-1.404,0.148c-0.469,0.098-0.885,0.258-1.251,0.479c-0.367,0.223-0.665,0.504-0.894,0.854 c-0.23,0.35-0.346,0.775-0.346,1.275c0,0.471,0.087,0.873,0.262,1.215c0.174,0.342,0.433,0.65,0.772,0.932 c0.341,0.281,0.754,0.555,1.244,0.818c0.488,0.264,1.052,0.555,1.69,0.865c0.653,0.324,1.275,0.666,1.862,1.021 c0.587,0.357,1.103,0.754,1.546,1.188c0.441,0.432,0.793,0.916,1.054,1.443c0.258,0.525,0.389,1.133,0.389,1.811 c0,0.904-0.178,1.666-0.53,2.293c-0.353,0.625-0.828,1.137-1.43,1.523c-0.599,0.393-1.291,0.676-2.074,0.852 s-1.608,0.264-2.477,0.264c-0.29,0-0.646-0.025-1.071-0.072c-0.427-0.049-0.859-0.117-1.303-0.203 c-0.443-0.09-0.862-0.201-1.258-0.332C699.055,98.926,698.737,98.777,698.5,98.617z"),
rsr.path("M722.425,93.344h-9.229c0.033,1.457,0.425,2.58,1.175,3.371 c0.747,0.791,1.776,1.188,3.089,1.188c1.473,0,2.825-0.484,4.061-1.457v1.969c-1.148,0.832-2.669,1.25-4.558,1.25 c-1.847,0-3.299-0.596-4.354-1.781c-1.058-1.188-1.583-2.855-1.583-5.01c0-2.035,0.575-3.691,1.729-4.975 c1.152-1.279,2.584-1.922,4.295-1.922c1.712,0,3.035,0.555,3.972,1.66s1.404,2.643,1.404,4.607L722.425,93.344L722.425,93.344z M720.279,91.57c-0.008-1.211-0.299-2.15-0.875-2.822c-0.574-0.672-1.372-1.01-2.394-1.01c-0.987,0-1.825,0.354-2.515,1.061 c-0.69,0.707-1.114,1.629-1.277,2.771H720.279L720.279,91.57z"))
).attr({
fill: '#010101',
stroke: '#000000',
'stroke-width': 0
});
我添加悬停并通过附加以下内容悬停事件：
.hover(
function(){Services.animate({"fill": "#128A8F"}, 500),
function(){Services.animate({"fill": "#010101"}, 500));
这很好用。
但是，我将此效果应用于我的脚本中的许多路径并通过悬停框应用它，因此我需要能够使悬停功能更具延展性。
我尝试使用下面的方法将悬停目标概括为传递的对象，但它可能不起作用，因为JavaScript是按值传递的：
function menuHoverIn(target){
target.animate({
"fill": "#128A8F"
}, 500);
};
function menuHoverOut(target){
target.animate({
"fill": "#010101"
}, 500)
};
那么如何使上述功能在JavaScript中得到应用呢？我只想让传递的对象动画化。
谢谢！
答案 0 :(得分：2)
你的问题非常模糊，但我想我知道你得到了什么：你只是希望能够将可重复使用的悬停功能传递给元素或集合。
在解决方案之前，我必须纠正一点：JavaScript不是一种按值传递的语言，至少在所有时间都不是。 JavaScript通过引用传递引用类型（对象），原子类型（字符串，数字，布尔值）按值传递（除非它们包含在关联的对象类型中）。
此外，在我继续之前，我想提出一些关于编写更好的SO问题的建议（更有可能得到回答）。首先，尝试将问题归结为简单易消化的问题。在这种情况下，没有人关心（或想要看到）你的长路。你可以用圆圈替换那些，你会有一个更容易阅读的问题。其次，提供重现问题所需的所有信息。不是每个人都会知道设置Raphael对象所涉及的细节等等。最好提供一个jsfiddle（对于像Raphael这样可能没有CDN的库来说可能会很棘手 - 但我能够在CDN上找到拉斐尔的副本。尝试遵循JavaScript惯例;它会减少试图回答你问题的人之间的混淆。在您的情况下，您调用对象Services，这不仅对您的问题的读者不透明，而且JavaScript中的大写变量通常保留给对象构造函数。
好的，关于解决方案：
如果查看documentation for hover，您会看到.hover()有两个函数，然后是两个上下文对象。这意味着JavaScript使用call或apply调用函数，它们设置函数的上下文（即this变量），就好像它们是方法调用一样。所以，你想要的是这样的：
var paper = Raphael( 0, 0, 200, 200 ); // create Raphael surface
// re-usable hover functions:
function menuHoverIn(){
// note the use of 'this'; we are animating the 'this' object,
// as if this were a method on an object. JavaScript is very
// flexible this way, and this method can (and will) be called
// as if it were a method of the element you're trying to animate
this.animate({'fill': '#128A8F'}, 500);
};
function menuHoverOut(){
this.animate({'fill': '#010101'}, 500);
};
var set = paper.set(); // create Raphael set; renamed from "Services" in OP
set.push( paper.circle( 50, 50, 25, 25 ) ) // put a circle in the set
.attr({ // set attributes of all elements in set
fill: '#010101',
stroke: '#000',
'stroke-width': 0
})
// provide .hover function for entire set; notice how we pass in set itself
// as the hover in and out context (which will become the 'this' value)
.hover( menuHoverIn, menuHoverOut, set, set );
事实证明，Raphael默认情况下将上下文设置为正在操作的对象，因此在这种情况下设置上下文实际上是不必要的。这就足够了：
.hover( menuHoverIn, menuHoverOut );
答案 1 :(得分：1)
你可以这样做：
var menuHoverIn = function(target) {
target.animate({
"fill": "#128A8F"
}, 500);
};
var menuHoverOut = function(target) {
target.animate({
"fill": "#010101"
}, 500)
};
something.hover( menuHoverIn, menuHoverOut );
以下是关于对象“和”功能的两篇好文章：http://hangar.runway7.net/javascript/guide和http://jamesallardice.com/explaining-function-and-variable-hoisting-in-javascript/
为另一个对象设置动画：
// Function.prototype.bind polyfill
if ( !Function.prototype.bind ) {
Function.prototype.bind = function( obj ) {
if(typeof this !== 'function') // closest thing possible to the ECMAScript 5 internal IsCallable function
throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
var slice = [].slice,
args = slice.call(arguments, 1),
self = this,
nop = function () {},
bound = function () {
return self.apply( this instanceof nop ? this : ( obj || {} ),
args.concat( slice.call(arguments) ) );
};
bound.prototype = this.prototype;
return bound;
};
}
var menuHoverIn = function(target) {
this.animate({
"fill": "#128A8F"
}, 500);
};
var menuHoverOut = function(target) {
this.animate({
"fill": "#010101"
}, 500)
};
something.hover( menuHoverIn.bind(YourElement), menuHoverOut.bind(YourElement) );
也许你必须做一些调整，但我有一个类似的代码与我合作。不要忘记用想要动画的元素替换元素。