string.substring(from, to)
var fullString = "Every dog has his day."; var section = fullString.substring(0, 4); // section is "Ever". section = fullString.substring(4, 0); // section is also "Ever". section = fullString.substring(1, 1); // section is an empty string. section = fullString.substring(-2, 4); // section is "Ever", same as fullString.substring(0, 4); slice()的原型为: string.slice(start, end)
string.substr(start, length)
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