javascript - 如何知道字符串在jQuery中以特定字符串开头/结尾？(How to know that a string starts/ends with a specific string in jQuery?)

Question

I want to know if a string starts with the specified character/string or ends with it in jQuery.(我想知道一个字符串是以指定的字符/字符串开头还是以jQuery结尾。)

For Example:(例如：)

var str = 'Hello World';

if( str starts with 'Hello' ) {
   alert('true');
} else {
   alert('false');
}

if( str ends with 'World' ) {
   alert('true');
} else {
   alert('false');
}

If there is not any function then any alternative ?(如果没有任何功能那么任何替代方案？)

  ask by Naveed translate from so

Answer 1

One option is to use regular expressions:(一种选择是使用正则表达式：)

if (str.match("^Hello")) {
   // do this if begins with Hello
}

if (str.match("World$")) {
   // do this if ends in world
}