javascript过滤字符串中的中文与空格

function moveSpace() {
 var str = " abc defg";
 alert(str.replace(/[ ]/g, ""));
}
moveSpace();

var title ="字符串zifuchuan"
var reg=/[u4E00-u9FA5]/g;
var result=title.replace(reg,'');
alert(result);

String.prototype.trim=function (){return this.replace(/(^/s*)|(/s*$)/g,'');}

String.prototype.sTrim = function (){return this.replace(//s/g, '');}