JS正则表达式检验数字或者带小数点的数字

1.
    var patrn = /^\d+(\.\d+)?$/;
    var num = 0.11;
    if (!patrn.exec(num)){
        alert("请您输入数字");return;
    }
2.
    var patten = /^[+-]?(0|([1-9]\d*))(\.\d+)?$/g;
    var num = 0.11;
    if(!patten.test(num)){
        alert("请您输入数字");return;
    }