javascript let str = "Hello, world!"; console.log(str.includes("world")); // 输出: true 如果尝试在非数组或非字符串上调用includes,比如一个对象或者null/undefined,将会抛出“is not a function”的错误。 确认JavaScript环境或浏览器支持: includes方法在ES6(ECMAScript 2015)中被引入。确保你的JavaScr...
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Javascript error: keepassxc-browser.js:1269 Uncaught TypeError: target.className.includes is not a function at Object.cipObserverHelper.ignoredElement (keepassxc-browser.js:1269) at Object.cipObserverHelper.handleObserverRemove (keepassxc-browser.js:1302) at MutationObserver.<anonymous> (keepassxc-browse...
TypeError: Raised when the type of a variable is not as expected. URIError: Raised when the encodeURI() or decodeURI() functions are used in an incorrect manner. 可以使用Error.name属性获取以上错误类型。如下代码: function captureErrorType(error) { switch (error.name) { case 'SyntaxError': ...
此时，有可能不经意的改动对其它功能造成了影响，bug复bug， bug何其多呀。
代码语言:javascript 复制 Array.prototype._includes=function(searchElement,fromIndex){if(this===null){thrownewTypeError('"this" is null or not defined');}letthat=Object(this),len=that.length>>>0,param=arguments,index=fromIndex|0;if(len===0){returnfalse;}startIndex=Math.max(index>=0?index...
Theincludes()method is a built-in JavaScript function that checks if a specific element or substring is present in an array or a string, respectively. It returns a boolean value:trueif the element or substring is found andfalseif it is not. ...
value: function(searchElement, fromIndex) { // 1. Let O be ? ToObject(this value). if (this == null) { throw new TypeError('"this" is null or not defined'); } var o = Object(this); // 2. Let len be ? ToLength(? Get(O, "length")). var len = o.length >>> 0; /...
export function observe (value: any, asRootData: ?boolean): Observer | void { /*判断是否是一个对象或者传入的值是否是VNode的属性*/ if (!isObject(value) || value instanceof VNode) { return } let ob: Observer | void /*这里用__ob__这个属性来判断是否已经有Observer实例,如果没有Observer实...
当前项目使用react+redux+postcss+webpack+ant实现的，本地开启了热更新以及自动刷新。更改js的时候可以...