var Result = '';
var oAjax = new XMLHttpRequest();
oAjax.open('POST', '', false);
oAjax.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
oAjax.onreadystatechange = function() {
if (oAjax.readyState == 4 && oAjax.status == 200) {
Result = oAjax.responseText;
} else {
console.log(oAjax);
}
};
oAjax.send('');
return Result;同步发送会等待并返回结果,在某些特定的环境中使用

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