Navigation: canGoBack 屬性
Navigation 介面的只讀屬性 canGoBack 返回一個布林值，指示是否可以導航回瀏覽歷史記錄（即，currentEntryfalse。
值
一個布林值：如果可以導航回瀏覽歷史記錄，則為 true；否則為 false。
示例
js
async function backHandler() {
if (navigation.canGoBack) {
await navigation.back().finished;
// Handle any required clean-up after
// navigation has finished
} else {
displayBanner("You are on the first page");
}
}
async function forwardHandler() {
if (navigation.canGoForward) {
await navigation.forward().finished;
// Handle any required clean-up after
// navigation has finished
} else {
displayBanner("You are on the last page");
}
}
規範
| 規範 |
|---|
| HTML # dom-navigation-cangoback-dev |
瀏覽器相容性
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