if sentence contains string

2018-05-29 15:56:50

This question already has an answer here:

How to check whether a string contains a substring in JavaScript? 49 answers

The method you're looking for is indexOf (Documentation). Try the following

if (sentence.indexOf('Hello World') >= 0) { 
  alert('Yes');
} else { 
  alert('No');
}

试试这个：

if (sentence.indexOf("Hello World") != -1)
{
    alert("Yes");
}
else
{
    alert("No");
}

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