var appid = '20190708000315764';
var key = 'uGQ16s3GBgAh0PWgCjr9';
chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
    var salt = (new Date).getTime();
    var query = request.src;
    // 多个query可以用\n连接  如 query='apple\norange\nbanana\npear'
    var from = 'en';
    var to = 'zh';
    var str1 = appid + query + salt +key;
    var sign = MD5(str1);

    $.ajax({
        url: 'http://api.fanyi.baidu.com/api/trans/vip/translate',
        type: 'post',
        dataType:"json",
        data:{
            q: query,
            appid: appid,
            salt: salt,
            from: from,
            to: to,
            sign: sign
        },
        async:false,
        success:function (r) {
            sendResponse(r);
        },
        error: function (r) {
            alert('翻译过程中出错！')
        }
    });
    return true;
});