String.prototype.startsWith = function (str) {
if (str == null || str == "" || this.length == 0 || str.length > this.length) {
return false;
}
if (this.substring(0, s.length) == str) {
return true;
} else {
return false;
}
return true;
}-sharp-sharp-sharp
I can"t put it directly in the script tag
/ / Please paste the code text below (do not replace the code with pictures)
can be placed in main.js.
but look at your code, the ES6 string extends this function, and you don't have to write it yourself.
in addition, extending the existing JS type directly is not a recommended approach.
can be added to index.html, just as you introduce third-party scripts.
ES6 has related functions, why do you extend it? string extension includes (), startsWith (), endsWith ()-ECMAScript 6 getting started-Ruan Yifeng
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