Javascript 从外部函数绑定事件侦听器
如何从init函数外部启动init内的重置函数 我希望我的重置函数重置从图像集合(本例中为3个)设置的所有变量,该集合绑定了3次。我知道我的例子不起作用 这是我的密码:Javascript 从外部函数绑定事件侦听器,javascript,hammer.js,Javascript,Hammer.js,如何从init函数外部启动init内的重置函数 我希望我的重置函数重置从图像集合(本例中为3个)设置的所有变量,该集合绑定了3次。我知道我的例子不起作用 这是我的密码: document.getElementsByClassName('zoomer-start')[0].addEventListener('click', init); document.getElementsByClassName('zoomer-reset')[0].addEventListener('cli
document.getElementsByClassName('zoomer-start')[0].addEventListener('click', init);
document.getElementsByClassName('zoomer-reset')[0].addEventListener('click', reset);
function init() {
var images = document.querySelectorAll('.zoomer-img');
for (var i = 0; i < images.length; i++) {
(function() {
var image = images[i];
var zoomer = new Hammer(image);
zoomer.get('pinch').set({enable: false});
zoomer.get('pan').set({enable: false});
var clicked = false;
var adjustScale = 1;
var adjustDeltaX = 0;
var adjustDeltaY = 0;
var currentScale = null;
var currentDeltaX = null;
var currentDeltaY = null;
zoomer.on('tap', function (e) {
if (!clicked) {
zoomer.get('pinch').set({enable: true});
zoomer.get('pan').set({enable: true, direction: Hammer.DIRECTION_ALL});
clicked = true;
} else {
zoomer.get('pinch').set({enable: false});
zoomer.get('pan').set({enable: false});
clicked = false;
}
if (currentScale > 1) {
adjustScale = 1;
adjustDeltaX = 0;
adjustDeltaY = 0;
} else {
adjustScale = 2;
}
currentScale = adjustScale * e.scale;
currentDeltaX = adjustDeltaX + (e.deltaX / currentScale);
currentDeltaY = adjustDeltaY + (e.deltaY / currentScale);
image.style.transform = 'scale(' + currentScale + ') translate3d(' + currentDeltaX + 'px, ' + currentDeltaY + 'px, 0)';
});
zoomer.on('pan pinch', function (e) {
currentScale = Math.max(1, Math.min(adjustScale * e.scale, 4));
currentDeltaX = adjustDeltaX + (e.deltaX / currentScale);
currentDeltaY = adjustDeltaY + (e.deltaY / currentScale);
var scaledX = ((((image.width * currentScale) / 2) - (image.width / 2)) / currentScale);
if (currentDeltaX > scaledX)
currentDeltaX = scaledX;
if (currentDeltaX < -scaledX)
currentDeltaX = -scaledX;
var scaledY = ((((image.height * currentScale) / 2) - (image.height / 2)) / currentScale);
if (currentDeltaY > scaledY)
currentDeltaY = scaledY;
if (currentDeltaY < -scaledY)
currentDeltaY = -scaledY;
image.style.transform = 'scale(' + currentScale + ') translate3d(' + currentDeltaX + 'px, ' + currentDeltaY + 'px, 0)';
});
zoomer.on('panend pinchend', function () {
adjustScale = currentScale;
adjustDeltaX = currentDeltaX;
adjustDeltaY = currentDeltaY;
});
function reset() {
zoomer.get('pinch').set({enable: false});
zoomer.get('pan').set({enable: false});
clicked = false;
adjustScale = 1;
adjustDeltaX = 0;
adjustDeltaY = 0;
currentScale = null;
currentDeltaX = null;
currentDeltaY = null;
image.style.transform = 'scale(' + 1 + ') translate3d(' + 0 + 'px, ' + 0 + 'px, 0)';
}
})();
}
}
document.getElementsByClassName('zoomer-start')[0]。addEventListener('click',init);
document.getElementsByCassName('zoomer-reset')[0]。addEventListener('click',reset');
函数init(){
var images=document.querySelectorAll('.zoomer img');
对于(var i=0;i1){
调整比例=1;
调整所得税=0;
adjustDeltaY=0;
}否则{
调整比例=2;
}
当前刻度=调整刻度*e.刻度;
currentDeltaX=调整deltaX+(如deltaX/currentScale);
currentDeltaY=调整deltaY+(如deltaY/currentScale);
image.style.transform='scale('+currentScale+')translate3d('+currentDeltaX+'px',+currentDeltaY+'px,0');
});
zoomer.on('pan pinch',函数(e){
currentScale=数学最大值(1,数学最小值(adjustScale*e.scale,4));
currentDeltaX=调整deltaX+(如deltaX/currentScale);
currentDeltaY=调整deltaY+(如deltaY/currentScale);
var scaledX=(((image.width*currentScale)/2)-(image.width/2))/currentScale);
如果(currentDeltaX>scaledX)
currentDeltaX=scaledX;
如果(currentDeltaX<-scaledX)
currentDeltaX=-scaledX;
var scaledY=(((image.height*currentScale)/2)-(image.height/2))/currentScale);
如果(currentDeltaY>scaledY)
currentDeltaY=scaledY;
如果(当前Deltay<-缩放)
currentDeltaY=-scaledY;
image.style.transform='scale('+currentScale+')translate3d('+currentDeltaX+'px',+currentDeltaY+'px,0');
});
zoomer.on('panend pinchend',函数(){
调整标度=当前标度;
adjustDeltaX=当前Deltax;
adjustDeltaY=当前Deltay;
});
函数重置(){
get('pinch').set({enable:false});
get('pan').set({enable:false});
单击=假;
调整比例=1;
调整所得税=0;
adjustDeltaY=0;
currentScale=null;
currentDeltaX=null;
currentDeltaY=null;
image.style.transform='scale('+1+')translate3d('+0+'px',+0+'px,0');
}
})();
}
}
将函数放在init函数内只会给它们提供私有作用域(只能从init函数内访问)要给它们提供全局作用域,必须将它们移到init函数外,这需要一些代码重组。将函数放在init函数内只会给它们提供私有作用域(只能从init函数中访问)要给它们全局作用域,您必须将它们移到init函数之外,这将需要一些代码重组。对于编写的代码,您不能这样做。reset
函数对于init
内的匿名函数中的代码是完全私有的。init
中的其他代码也不能访问它,更不用说了代码在init
之外
我在上面说“it”,但实际上,您有多个reset
函数,每个图像一个
当然,您可以将试图将其用作单击处理程序的代码移动到
init
内部的匿名函数中。这基本上是您唯一的实际选择,而不是创建数组或类似的reset
函数,您在init
外部公开这些函数,而代码是编写好的,您无法执行e> 函数对于init
内部的匿名函数中的代码是完全私有的。即使init
中的其他代码也无法访问它,更不用说init
外部的代码了
我在上面说“it”,但实际上,您有多个reset
函数,每个图像一个
当然,您可以将试图将其用作单击处理程序的代码移动到init
内部的匿名函数中。这基本上是您唯一的实际选择,而不是创建数组或类似的reset
函数,这些函数在i外部公开
var resets = [];
function init() {
[...]
for (var i = 0; i < images.length; i++) {
(function() {
[...]
resets[i]=function reset() {
[...]
})
resets[0](); resets[1](); resets[2];
resets.forEach(function(f) { f(); } );
var resets = [];
document.getElementsByClassName('zoomer-start')[0].addEventListener('click', init);
document.getElementsByClassName('zoomer-reset')[0].addEventListener('click', function () {
var images = document.querySelectorAll('.zoomer-img');
for (var i = 0; i < images.length; i++) {
resets[i]();
}
});
function init() {
var images = document.querySelectorAll('.zoomer-img');
for (var i = 0; i < images.length; i++) {
(function(i) {
var image = images[i];
var zoomer = new Hammer(image);
zoomer.get('pinch').set({enable: false});
zoomer.get('pan').set({enable: false});
var clicked = false;
var adjustScale = 1;
var adjustDeltaX = 0;
var adjustDeltaY = 0;
var currentScale = null;
var currentDeltaX = null;
var currentDeltaY = null;
zoomer.on('tap', function (e) {
if (!clicked) {
zoomer.get('pinch').set({enable: true});
zoomer.get('pan').set({enable: true, direction: Hammer.DIRECTION_ALL});
clicked = true;
} else {
zoomer.get('pinch').set({enable: false});
zoomer.get('pan').set({enable: false});
clicked = false;
}
if (currentScale > 1) {
adjustScale = 1;
adjustDeltaX = 0;
adjustDeltaY = 0;
} else {
adjustScale = 2;
}
currentScale = adjustScale * e.scale;
currentDeltaX = adjustDeltaX + (e.deltaX / currentScale);
currentDeltaY = adjustDeltaY + (e.deltaY / currentScale);
image.style.transform = 'scale(' + currentScale + ') translate3d(' + currentDeltaX + 'px, ' + currentDeltaY + 'px, 0)';
});
zoomer.on('pan pinch', function (e) {
currentScale = Math.max(1, Math.min(adjustScale * e.scale, 4));
currentDeltaX = adjustDeltaX + (e.deltaX / currentScale);
currentDeltaY = adjustDeltaY + (e.deltaY / currentScale);
var scaledX = ((((image.width * currentScale) / 2) - (image.width / 2)) / currentScale);
if (currentDeltaX > scaledX)
currentDeltaX = scaledX;
if (currentDeltaX < -scaledX)
currentDeltaX = -scaledX;
var scaledY = ((((image.height * currentScale) / 2) - (image.height / 2)) / currentScale);
if (currentDeltaY > scaledY)
currentDeltaY = scaledY;
if (currentDeltaY < -scaledY)
currentDeltaY = -scaledY;
image.style.transform = 'scale(' + currentScale + ') translate3d(' + currentDeltaX + 'px, ' + currentDeltaY + 'px, 0)';
});
zoomer.on('panend pinchend', function () {
adjustScale = currentScale;
adjustDeltaX = currentDeltaX;
adjustDeltaY = currentDeltaY;
});
resets[i] = function reset() {
zoomer.get('pinch').set({enable: false});
zoomer.get('pan').set({enable: false});
clicked = false;
adjustScale = 1;
adjustDeltaX = 0;
adjustDeltaY = 0;
currentScale = null;
currentDeltaX = null;
currentDeltaY = null;
image.style.transform = 'scale(' + 1 + ') translate3d(' + 0 + 'px, ' + 0 + 'px, 0)';
}
})(i);
}
}