Uncaught InvalidStateError: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.
如何解决 各位大牛。
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Ajax.SsetRequestHeader的问题
xhr.setRequestHeader('content-type','application/x-www-form-urlencoded'); 浏览器报错 Uncaught InvalidStateError: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED. 如何解决 各位大牛。