substring.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 13 行

// create and initialize a string variable
var str = "JavaScript in easy steps";

// get two substrings with the substring() method
var sub1 = str.substring(14,19) +  str.substring(0,11)

// get two substrings with the substr() method
var sub2 = str.substr(14,5) + str.substr(0,10);

// display all the substrings
var res = "Substring method : " +sub1;
res += "\nSubstr method : " +sub2;
alert(res);