具体字符串，可以这样解决


var ws = "\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF";
if (!String.prototype.trim || ws.trim()) {
    // http://blog.stevenlevithan.com/archives/faster-trim-javascript
    // http://perfectionkills.com/whitespace-deviations/
    ws = "[" + ws + "]";
    var trimBeginRegexp = new RegExp("^" + ws + ws + "*"),
        trimEndRegexp = new RegExp(ws + ws + "*$");
    String.prototype.trim = function trim() {
        if (this === void 0 || this === null) {
            throw new TypeError("can't convert "+this+" to object");
        }
        return String(this)
            .replace(trimBeginRegexp, "")
            .replace(trimEndRegexp, "");
    };
}
jQuery常用的用的方法


$(function () { 
    var str = "         lots of spaces before and after         ";
    $( "#original" ).html( "Original String: '" + str + "'" );
    $( "#trimmed" ).html( "$.trim()'ed: '" + $.trim(str) + "'" );
})


存在html强制解决


var a=document.body.innerHTML;
document.body.innerHTML=a.replace(/\ufeff/g,'');