为什么status HTTP状态码会是0？ <body> <input id="con_" type="text" value=" " > <button id="submit_">submit</button> <script> submit_.onclick = function(){ console.log(1) var xhr =new XMLHttpRequest(); xhr.open('get','datas.js',true); xhr.send(); xhr.onload = function(){ console.log(2) if( xhr.readyState == 4 && xhr.status === 0 ){ console.log(3) // console.log(xhr.response); } } } </script></body>
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