In the function, we throw the error if the search string is a type of regular expression. Also, the ?pos' parameter is an option, so if the user doesn't pass it, consider it zero. At last, use the indexof() method to check whether a string contains the word, and return a ...
TypeError: cannot use 'in' operator to search for 是一个 JavaScript 运行时错误,表示你尝试在一个非对象(如 null 或undefined)上使用 in 操作符。in 操作符通常用于检查一个属性是否存在于某个对象中。 常见原因 右侧操作数为非对象类型: 如果in 操作符的右侧操作数不是对象(如 null、undefined、数字、字...
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How to Use Cookies in JavaScript. Although not strictly part of the CSS style switcher series, the cookie management code provided in that article is used to preserve the theme selection that your visitors make on your site. Without setting a cookie, their CSS setting will not be retained whe...
JavaScript 使用 for 循环时出现的问题 有一些项目组在定位问题的时候发现,在使用 “for(x in array)” 这样的写法的时候,在 IE 浏览器下,x 出现了非预期的值。...Array.prototype.indexOf 方法(譬如源于某 prototype 污染),也许是因为老版本 IE 浏览器并不支持 array.indexOf 方法,而开发者又很想用,那么...
indexOf(plugin) >-1) { returnthis } // 取vue.use参数,toArray() 方法代码在下一个代码块constargs=toArray(arguments, 1) args.unshift(this) // 判断插件是否有install方法,如果有就执行install()方法。没有就直接把plugin当Install执行。if (typeofplugin.install==='function') { plugin.install....
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_.lastIndexOf Returns the index of the last occurrence of value in the array, or -1 if value is not present. // Underscore/Lodash var array = [2, 9, 9, 4, 3, 6] var result = _.lastIndexOf(array, 9) console.log(result) // output: 2 // Native var array = [2, 9, 9,...