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html javascript history pushstate popstate back button

假设http://mozilla.org/foo.html页面执行了一下js
var stateObj = { foo: "bar" }; history.pushState(stateObj, "page 2", "bar.html");
这种方法将会使url地址栏显示http://mozilla.org/bar.html，但浏览器不会加载bar.html页面，即使这个页面存在也不会加载。

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