1. pattern.test(str);
返回值是boolean类型，匹配返回true，不匹配返回false
2. pattern.exec(str);
返回值是object类型，匹配返回str对应的字符串，不匹配返回null
var pattern = new RegExp("box","igm");
var str = "Box";
alert(pattern.test(str)); // truevar pattern = /box/i;var str = "This is a Box";
alert(pattern.test(str)); // truevar pattern = /box/i;var str = "Box";
alert(pattern.exec(str)); //Boxvar pattern = /box/i;var str = "aox";
alert(pattern.exec(str)); //null
作者：椰果粒
链接：https://www.jianshu.com/p/f624ce767288