问题描述:

I can't seem to access the window.history.state object when my popState is triggered in Safari 5 (the page goes back). This code works perfectly in Chrome 19 and Firefox 12.

window.onload = function() {

window.setTimeout(function() {

var original = window.location.href;

window.addEventListener("popstate", function(e) {

if (window.history.state !== null) {

var type = window.history.state.type;

var page = window.history.state.page;

//custom Ajax function below

getContent({type:type, page:page, category: category}, '/' + type + '/' + page);

} else {

window.location = original;

}

}, false);

}, 1);

}

console.log(window.history.state) in Safari 5 returns 'undefined'.

网友答案:

window.history.state is only available in some browsers. It's not part of the spec per se.

Feature           │ Chrome  │ Firefox (Gecko)  │  IE  │ Opera  │ Safari
──────────────────┼─────────┼──────────────────┼──────┼────────┼───────
replace/pushState │   5     │    4.0 (2.0)     │  10  │ 11.50  │  5.0
history.state     │  18     │    4.0 (2.0)     │  10  │ 11.50  │  ---
网友答案:

So if history.state is supported then the value will be null(or an object if the browser is remembering the state), otherwise it will be undefined. And I ended up with this code to check whether it's supported or not

(window.history && history.pushState && history.state !== undefined) 
? true : false;

Tested in latest Chrome, Safari 5, 6, IE 9

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