javascript 如何使用 e.preventDefault(); 在 ipad/iphone 中禁用、启用，然后再次禁用滚动？
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How to disable, enable, then disable again scrolling in ipad/iphone with e.preventDefault();?
提问by cat
I have it disabled already, and I can enable it again. I used:
我已经禁用它，我可以再次启用它。我用了：
document.ontouchmove = function(e){
e.preventDefault();
}
In the document.ready(); to disable it.
在文档中。ready(); 禁用它。
And I used this to enable it.
我用它来启用它。
function doTouchMove(state) {
document.ontouchmove = function(e){
return state;
}
}
I have it so when a user double clicks on an element, the doTouchMove is called. But how do I make it disabled again?
我有它，所以当用户双击一个元素时，会调用 doTouchMove。但是我如何使它再次禁用？
Thanks
谢谢
回答by Andy E
You could create a toggle instead, where your doTouchMove()function switches between falseand trueevery time it's called:
您可以创建一个切换，每次调用时，您的doTouchMove()函数都会在false和true之间切换：
(function () { // Set up a closure so we don't pollute the global scope
var state = false;
function doTouchMove() {
state = !state;
}
document.ontouchmove = function(e){
return state;
}
document.getElementById("myDoubleClickElement").ondblclick = doTouchMove;
})();
Now, every time you double-click #myDoubleClickElement, it will toggle the statevariable's value between falseand true, effectively disabling on the even clicks and enabling on the odd clicks.
现在，每次双击#myDoubleClickElement 时，它都会在false和true之间切换状态变量的值，从而有效地禁用偶数点击并启用奇数点击。
回答by cat
Im the same user who asked this question... but I cleared my history & everything so I can't pick an answer or anything!
我是问这个问题的同一用户......但我清除了我的历史记录和所有内容，所以我无法选择答案或任何东西！
But what I did to fix it was put this
但我所做的修复它是把这个
document.ontouchmove = function(e){
e.preventDefault();
}
Into its own function, just as the doTouchMove() was. Then when I wanted it to stop moving again i would just call the name of that preventDefault function.
进入它自己的函数，就像 doTouchMove() 一样。然后当我希望它再次停止移动时，我会调用该 preventDefault 函数的名称。
I don't know why it makes a difference but it works! :)
我不知道为什么它会有所不同，但它有效！:)
