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| oBtn.onclick = function(){ if(window.XMLHttpRequest){ var oAjax = new XMLHttpRequest(); } else{ var oAjax = new ActiveXObject("Microsoft.XMLHttp"); }
oAjax.open('GET','data.json',true);
oAjax.send();
oAjax.onreadystatechange = function(){ if(oAjax.readyState == 4){ if(oAjax.status == 200){ console.log("成功"+oAjax.responseText); } else{ console.log("失败"); } } } } }
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