将html代码拖拽进入chrome通过file协议浏览时,发送的ajax请求本地文件,会报跨域错误. XMLHttpRequest cannot load file:///E:/webs/extJS/ext-3.3.0/examples/csdn/combobox.txt?_dc=1414738973999. Cross origin requests are only supported for protocol schemes: http, data, chrome-extension, h