判断是否跨域：
var xhr = new XMLHttpRequest();
xhr.open(‘POST’, ‘https://wenda.hixue.cn/talk-service/talk/getvideosignature’);;)
xhr.send(null);
xhr.onload = function(e) {
var xhr = e.target;
console.log(xhr.responseText);
}
若有收获，就点个赞吧
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