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;
}