var reg = /d[*]/;//中括号中的*不用转义
console.log(reg.exec("d"));//null
console.log(reg.exec("d*"));//["d*",index: 0,input: "d*"]
var reg = /d[*]/;//中括号中的*不用转义
console.log(reg.exec("d"));//null
console.log(reg.exec("d*"));//["d*",index: 0,input: "d*"]