替换一次用replace
var str = "hello";
console.log(str.replace('h','xxx'));
替换全部用正则
var str = "hello";
console.log(str.replace(/h/gi,'xxx'));
var str = "hello";
console.log(str.replace('h','xxx'));
var str = "hello";
console.log(str.replace(/h/gi,'xxx'));
转载于:https://my.oschina.net/liuchangng/blog/883577