<!DOCTYPE html> <html> <head> <title></title> </head> <body> <script type="text/javascript"> /*let str="abc";
let newstr=str.replace("a","m");
console.log(newstr);
let a="c";
let b="y";
let c="g";
let d=a+b+c;
console.log(d);*/ /*let f="cyg";
let str=new String(f);
//let str="www.baiud.com";
console.log(str.length);
str.split(".");
*/ </script> </body> </html>
new String（） split详解
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