在页面上的所有AJAX请求中添加一个“hook”
我想知道是否有可能“钩住”每个AJAX请求(即将发送或发生事件)并执行操作。此时,我假设页面上还有其他第三方脚本。其中一些可能使用jQuery,而其他一些则没有。这可能吗?
回答:
脚本中的注释 ,当然 。
我认为如果正在使用javascript库,它将起作用,因为如果可能的话,它们将使用本机对象。
function addXMLRequestCallback(callback){ var oldSend, i;
if( XMLHttpRequest.callbacks ) {
// we've already overridden send() so just add the callback
XMLHttpRequest.callbacks.push( callback );
} else {
// create a callback queue
XMLHttpRequest.callbacks = [callback];
// store the native send()
oldSend = XMLHttpRequest.prototype.send;
// override the native send()
XMLHttpRequest.prototype.send = function(){
// process the callback queue
// the xhr instance is passed into each callback but seems pretty useless
// you can't tell what its destination is or call abort() without an error
// so only really good for logging that a request has happened
// I could be wrong, I hope so...
// EDIT: I suppose you could override the onreadystatechange handler though
for( i = 0; i < XMLHttpRequest.callbacks.length; i++ ) {
XMLHttpRequest.callbacks[i]( this );
}
// call the native send()
oldSend.apply(this, arguments);
}
}
}
// e.g.
addXMLRequestCallback( function( xhr ) {
console.log( xhr.responseText ); // (an empty string)
});
addXMLRequestCallback( function( xhr ) {
console.dir( xhr ); // have a look if there is anything useful here
});
以上是 在页面上的所有AJAX请求中添加一个“hook” 的全部内容, 来源链接: utcz.com/qa/427051.html