站长手册

var str = “abcdefg”;

str = str.replace(“de”,”12”);

str = str.replace(“b”,”b1e”);

或者

var str = “abcdefg”;

str = str.split(“de”,”12”);

var str1 = str.subString(0,str.indexOf(‘b’)+1);

var str2 = str.subString(str.indexOf(‘b’)+1);

str = str1+”1e”+str2;