JS生成Guid字符串

function newGuid(){
    var guid = "";
    for (var i=1; i<=32; i++){
        var n = Math.floor(Math.random()*16.0).toString(16);
        guid +=   n;
        if((i==8)||(i==12)||(i==16)||(i==20))
            guid += "-";
    }
    return guid;
}

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