《JavaScript And DHTML Cookbook》学习笔记

　　此文为读《JavaScript And DHTML Cookbook》后总结出来的笔记。由于当时是初学，所以笔记中难免有错误，欢迎指正。谢谢！
·字符串(String)
  1.声明
    var myString = new String("Every good boy does fine.");
    var myString = "Every good boy does fine.";
  2.字符串连接
    var myString = "Every " + "good boy " + "does fine.";
    var myString = "Every ";  myString += "good boy does fine.";
  3.截取字符串
    //截取第 6 位开始的字符
    var myString = "Every good boy does fine.";
    var section = myString.substring(6);    //结果: "good boy does fine."
   
    //截取第 0 位开始至第 10 位为止的字符
    var myString = "Every good boy does fine.";
    var section = myString.substring(0,10); //结果: "Every good"
   
    //截取从第 11 位到倒数第 6 位为止的字符
    var myString = "Every good boy does fine.";
    var section = myString.slice(11,-6);    //结果: "boy does"
   
    //从第 6 位开始截取长度为 4 的字符
    var myString = "Every good boy does fine.";
    var section = myString.substr(6,4);     //结果: "good"
  4.转换大小写
    var myString = "Hello";
    var lcString = myString.toLowerCase();  //结果: "hello"
    var ucString = myString.toUpperCase();  //结果: "HELLO"
  5.字符串比较
    var aString = "Hello!";
    var bString = new String("Hello!");
    if( aString == "Hello!" ){ }    //结果: true
    if( aString == bString ){ }     //结果: true
    if( aString === bString ){ }    //结果: fa