浏览器监听所有xhr请求

var origOpen = XMLHttpRequest.prototype.open;

XMLHttpRequest.prototype.open = function() {

    this.addEventListener(‘load‘, function() {

        // console.log(this.readyState); //will always be 4 (ajax is completed successfully)
        // console.log(this.responseText); //whatever the response was

        console.log(1)

    })

    origOpen.apply(this, arguments)
}