The test is a function that accepts both an array item and its index. Solution 3 addresses two issues. Firstly, replacing the last element of the array. Secondly, modifying the original array. To clarify, the solution would be to implement the suggested fix. Moving on to Solution 4, it s...
functionfn2(){this.a=3;this.b=10;}fn2();//因为直接调用函数this就是window，//因此，这里等于...
这个this就是这个数组对象例如：//求数组中数值元素的和Array.prototype.sum=function(){varsum=0;//t...
console.log(a); Function.prototype.method=function(name,func){this.prototype[name] =func;returnthis; } Array.method('splice',function(start,deleteCount){varmax =Math.max, min=Math.min, delta, element, insertCount= max(arguments.length - 2,0);//除了start和deleteCount两个参数外,其他参数的长...
react.js中render的return的坑 demo代码: var HelloComponent=React.createClass({ render:function(){ return Hello World} }); ReactDOM.render( <HelloComponent... nuxt.js框架中 audio标签的坑 一、前言 上星期接到一个需求,业主说要在移动端的考试系统中弄一个背景音乐上去,让人听着做题更舒服,并...
functiondeepClone(source){// 判断复制的目标是数组还是对象lettargetObj=source.constructor===Array?[]:{};if(source&&typeofsource==="object"){// 遍历目标for(letkeyinsource){if(source.hasOwnProperty(key)){// 如果值是对象,就递归一下targetObj[key]=deepClone(source[key]);}}}else{targetObj=...
app = new Vue({ el: "#app", data: { objects: ["A", "B", "C", "D"], dataList: [ { code: "001", name: "test01" }, { code: "002", name: "test02" }, ], }, computed: {}, methods: { getPush: function () { //1.数组添加push() let objectItem = "1"; this....
JS中substr, substring, split, splice, slice,join方法总结 substr: stringObject.substr(start, length), 返回新字符串,包含start处字符,start参数必需,length可选。 substring: stringObject.substring(start, stop), 返回新字符串,包含start处字符,不包含stop处字符,start参数必需,stop可选。 split: string...
"shift", getFunction("shift", ArrayShift), "unshift", getFunction("unshift", ArrayUnshift, 1), "slice", getFunction("slice", ArraySlice, 2), "splice", getFunction("splice", ArraySplice, 2), "sort", getFunction("sort", ArraySort), ...
function checkAdult(age) { return age >=18; } function myFunction() { document.getElementById("demo").innerHTML = ages.filter(checkAdult); } 输出结果为: 32,33,40 reverse:将数组反序 var a = [1,2,3,4,5]; var b = a.reverse(); //a:[5,4,3,2,1] b:[5,4,3,2,1] ...