JavaScript实用技术点总结

1. 数组去重

let a = [null,undefined,1,null,undefined,1,3,3,'1111','444','1111',true,false,false];
let b = [ ...new Set(a) ];
console.log(b);    // [null, undefined, 1, 3, "1111", "444", true, false]

2. 字符串中变量的全局替换

let varItem = [
    {
        code: 'KHMC',
        title: '客户名称'
    },
    {
        code: 'CPMC',
        title: '产品名称'
    }
];
let msg = '我的${产品名称}是根据${客户名称}定义的${产品名称}';
varItem.forEach(i => {
    let newReg = eval('\/\\$\\{'+i.title+'\\}\/');
    msg = msg.replace(new RegExp(newReg,'g'),'${'+i.code+'}');
});
console.log(msg);    // "我的${CPMC}是根据${KHMC}定义的${CPMC}"

3. 数组对象属性排序

let obj = [{age:1},{age:2},{age:10},{age:11},{age:5},{age:99},{age:7}];
function compare(property){
    return function(a,b){
        let value1 = a[property];
        let value2 = b[property];
        return value1 - value2;
    }
}
let newObj = obj.sort(compare('age'));
console.log(newObj);    // [{a:1},{a:2},{a:5},{a:7},{a:10},{a:11},{a:99}];