JS给XMLHttpRequest添加filter
function XMLHttpRequestFilter(){ let base = XMLHttpRequest.prototype.open; let filter_list = []; let add = function(fun, key='_fn'){ filter_list.push([key, fun]) XMLHttpRequest.prototype.open = function(...args){ filter_list.map(x=>{ let check = x[1](args) if(check){ throw check; } }); base.apply(this,args) } }; let remove = function(key='_fn'){ filter_list = filter_list.filter(x=>x[0]!=key); }; let removeAll = function(){ filter_list.length=0; XMLHttpRequest.prototype.open = base }; return {add, remove, removeAll} } t.add(console.log, 'k1') t.add(console.dir, 'k2') t.add(console.log, 'k3') t.remove('k2') t.removeAll() t.add(console.log, "k1") t.add(()=>"123", 'k2') t.add(console.dir, "k1") t.remove("k2")