var item = myArray[(Math.random()*myArray.length)|0]; 样例代码: var myArray = ['January', 'February', 'March']; var item = myArray[(Math.random()*myArray.length)|0]; console.log('item:', item); 1. #12楼 var rand = myArray[Math.floor(Math.random() * myArray.length)];...
//Math.random()获取随机数0-1的随机数 re=Math.random()+' ';//0-1随机数 document.write('0-1随机数'+re);...//取随机数 0-5之间 re1=Math.random()*5;//0-1随机数 document.write('0-...
index, arr) { if(item === "red") { arr.splice(index, 1); } }) var colors = ["red", "blue", "grey"]; colors = colors.filter(function(item) { return item != "red"}); console.log(colors); // ["blue", "grey"]
使用随机延迟 function randomDelay(min, max) { return new Promise(resolve => setTimeout(resolve, Math.random() * (max - min) + min) ); } 1. 2. 3. 4. 5. 处理Cookie const jar = new tough.CookieJar(); axios.get(url, { jar: jar, withCredentials: true }); 1. 2. 3. 4. 5...
array.flat(n)是es10嵌入层叠的api,n表示尺寸,n变化infinity时维度为无限大 2.开始篇 function flatten ( arr ) { while (arr.some( item => array .isarray(item))) { arr = [].concat(...arr); } return arr; } flatten([ 1 ,[ 2 , 3 ]]...
/*** 获取视频第一帧当作封面* @param {object|string} file 文件对象|视频链接* @returns*/exportfunctionextractVideoCover(file){returnnewPromise((resolve)=>{constvideo=document.createElement('video')constcanvas=document.createElement('canvas')constcontext=canvas.getContext('2d')video.preload='metadata'...
random() * 4); var src = this.imgArray[index]; var width = 50 + index * 10; var height = 50 + index * 10; this.modes.push({ lever: index, width: width, height: height, src: src, top: 0, left: 120, speedX: 0, speedY: 10, }) } 在index.hml文件中,遍历modes数组,用...
Array(5).fill(1).map((x,i) => ({id:i})) } } componentDidMount(){ const random = (a,b) => Math.random() < .5 ? -1 : 1 setInterval(() => { this.setState({ items: this.state.items.sort(random) }) }, 20) } render...
topicIds Array Optional count string Optional Example unsplash.photos.getRandom({}); unsplash.photos.getRandom({ count: 10, }); unsplash.photos.getRandom({ collectionIds: ['abc123'], topicIds: ['def456'], featured: true, username: 'naoufal', query: 'dog', count: 1, }); photos.track...
random()类的静态MathObject方法。 Math_round101 round(Double)类的静态MathObject方法。 Math_sin102 sin(Double)类的静态MathObject方法。 Math_sqrt103 sqrt(Double)类的静态MathObject方法。 Math_tan104 tan(Double)类的静态MathObject方法。 None0