Js中遇到的坑点汇总

一、Android 手机下输入框获取焦点时, 输入法挡住输入框的 bug

解决思路：

1.去掉overflow属性 

2. Android 手机下, input 或 textarea 元素聚焦时, 主动滚一把

 if (/Android/gi.test(navigator.userAgent)) {
            window.addEventListener('resize', function () {
                if (document.activeElement.tagName == 'INPUT' || document.activeElement.tagName == 'TEXTAREA') {
                    window.setTimeout(function () {
                        document.activeElement.scrollIntoViewIfNeeded();
                    }, 0);
                }
            })
}

二、js获取ip地址

/**
 * Get the user IP throught the webkitRTCPeerConnection
 * @param onNewIP {Function} listener function to expose the IP locally
 * @return undefined
 */
function getUserIP(onNewIP) { //  onNewIp - your listener function for new IPs
    //compatibility for firefox and chrome
    var myPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
    var pc = new myPeerConnection({
        iceServers: []
    }),
    noop = function() {},
    localIPs = {},
    ipRegex = /([0-9]{1,3}(.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/g,
    key;

    function iterateIP(ip) {
        if (!localIPs[ip]) onNewIP(ip);
        localIPs[ip] = true;
    }

     //create a bogus data channel
    pc.createDataChannel("");

    // create offer and set local description
    pc.createOffer(function(sdp) {
        sdp.sdp.split('
').forEach(function(line) {
            if (line.indexOf('candidate') < 0) return;
            line.match(ipRegex).forEach(iterateIP);
        });
        
        pc.setLocalDescription(sdp, noop, noop);
    }, noop); 

    //listen for candidate events
    pc.onicecandidate = function(ice) {
        if (!ice || !ice.candidate || !ice.candidate.candidate || !ice.candidate.candidate.match(ipRegex)) return;
        ice.candidate.candidate.match(ipRegex).forEach(iterateIP);
    };
}

// Usage

getUserIP(function(ip){
        console.log('ip address : '+ip)
});