我正在尝试更改 functiontest
中的 gaTop
var,但我不明白为什么它不起作用
var gaTop = 0;
functionTest = function(callback)
{
$('html').on("mousewheel DOMMouseScroll", function(e)
{
var delta = (e.originalEvent.wheelDelta || -e.originalEvent.detail);
if (delta < 0)
{
var gaTop = -100;
}
else if (delta > 0)
{
var gaTop = +100;
}
console.log(gaTop);
callback(gaTop);
});
}
functionTest(function(e)
{
console.log(gaTop);
});
最佳答案
引用:Declaring vs Initializing a variable?
var ga = 0;
var gaTop = null;
functionTest = function(callback) {
$('html').on("mousewheel DOMMouseScroll", function(e) {
var delta = (e.originalEvent.wheelDelta || -e.originalEvent.detail);
if (delta < 0) {
gaTop = -100;
}
else if (delta > 0) {
gaTop = 100;
}
console.log(gaTop);
callback(gaTop);
});
}
functionTest(function(e) {
console.log(gaTop);
});
关于javascript - 更改事件处理函数中的变量值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41346854/