JavaScript檢查子字串是否在字串中的方法_javascript技巧

本文實例講述了JavaScript檢查子字串是否在字串中的方法。分享給大家參考，具體如下：

var strnew="Hello Raghu How are u"
//Checking existence in entire string
if(strnew.indexOf("Raghu") != -1 )
{
  alert("Exists");
}
/*
Checking existence at the end of string
For example, variable result1 in the following example is assigned 
the value of true because the word "Ishmael" appears at the end of 
the string. Variable result2 is assigned a value of false because 
"Raghu" doesn't appear at the end of the string.
*/
result1 = /Raghu$/.test("Call me Raghu");
result2 = /Raghu$/.test("Call me Raghu. Some years ago");
/*
Checking existence in the begining of string
In the following example, variable result1 is assigned the value 
of true because the word "Birds" appears at the beginning of the 
string. Variable result2 is assigned the value of false because 
"Birds" doesn't appear at the beginning of the string.
*/
result1 = /^Birds/.test("Birds fly");
result2 = /^Birds/.test("Big Birds fly");

更多關於JavaScript相關內容有興趣的讀者可查看本站專題：《JavaScript查找演算法技巧總結》及《JavaScript資料結構與演算法技巧總結》

希望本文所述對大家JavaScript程式設計有所幫助。