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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..
startsWith() , , , , true false.
str.startsWith(searchString[, position])
searchString, .
position . , searchString; 0.
, .
startsWith()var str = " , .";
console.log(str.startsWith("")); // true
console.log(str.startsWith(" ")); // false
console.log(str.startsWith(" ", 9)); // true
ECMAScript 6 JavaScript. , :
if (!String.prototype.startsWith) {
Object.defineProperty(String.prototype, "startsWith", {
enumerable: false,
configurable: false,
writable: false,
value: function (searchString, position) {
position = position || 0;
return this.indexOf(searchString, position) === position;
},
});
}
String.prototype.endsWith() String.prototype.includes() String.prototype.indexOf()String.prototype.lastIndexOf()This page was last modified on 20 . 2024 . by MDN contributors.
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