Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.
在設置請求頭的時候報這個Failed to execute ‘setRequestHeader‘ on ‘XMLHttpRequest‘: The object‘s state must be OPENED.,是由於需要先打開XMLHttpRequest
var xhr = new XMLHttpRequest(); //打開xhr xhr.open(‘GET‘,url ); //設置請求頭,請求頭的設置必須在xhr打開之後,並且在send之前 xhr.setRequestHeader(‘user-sessionid‘, sessionId);
Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.
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