function link(str) {
    // var ele = document.getElementById('jsContainer');
    // var str = ele.innerHTML;
    var reg = /(http:\/\/)[0-9A-Za-z]+\.[0-9A-Za-z]+\.\w+|(https:\/\/)[0-9A-Za-z]+\.[0-9A-Za-z]+\.\w+|(www\.)[0-9A-Za-z]+\.\w+|w+/g;
    //var reg = /w+/g;
    str = str.replace(reg, function (item) {
        console.log(1);
        if(item[0]==='w'){
            item = 'http:\/\/'+item
        }
        return '<a href = ' +'\"'+ item +'\"'+ ' target="_blank">'+item+'</a>'
    });
    //le.innerHTML; = str;
    return str
}  

这个代码同样没通过~~