DDR爱好者之家 Design By 杰米

本文实例讲述了JavaScript检查子字符串是否在字符串中的方法。分享给大家供大家参考,具体如下:

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");

更多关于JavaScript相关内容感兴趣的读者可查看本站专题:《JavaScript查找算法技巧总结》及《JavaScript数据结构与算法技巧总结》

希望本文所述对大家JavaScript程序设计有所帮助。

DDR爱好者之家 Design By 杰米
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DDR爱好者之家 Design By 杰米

RTX 5090要首发 性能要翻倍!三星展示GDDR7显存

三星在GTC上展示了专为下一代游戏GPU设计的GDDR7内存。

首次推出的GDDR7内存模块密度为16GB,每个模块容量为2GB。其速度预设为32 Gbps(PAM3),但也可以降至28 Gbps,以提高产量和初始阶段的整体性能和成本效益。

据三星表示,GDDR7内存的能效将提高20%,同时工作电压仅为1.1V,低于标准的1.2V。通过采用更新的封装材料和优化的电路设计,使得在高速运行时的发热量降低,GDDR7的热阻比GDDR6降低了70%。