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背景
在日常开发中,咱们常常会用一些工具类办法来实现业务逻辑 上面列举几种最罕用的
URL 截取参数
// 间接调用输出想要截取的参数名称几个
export function getParamFromUrl(key) {if (key === undefined) return null;
let search = location.search.substr(1);
let mReg = new RegExp('(^|&)' + key + '=([^&]*)(&|$)');
let mValue = search.match(mReg);
if (mValue != null) return unescape(mValue[2]);
return null;
}
// 示例
let city = getParamFromUrl('city');
JSON 是否为空判断
// 输出想要检测的 json 数据 如果为空返回返回 false
export function isNullObject(model) {if (typeof model === "object") {
let hasProp = false;
for (const prop in model) {
hasProp = true;
break;
}
if (hasProp) {return false;}
return true;
} else {throw "model is not object";}
}
数据类型检测
// 检测变量的数据类型
export function getParamType(item) {if (item === null) return null;
if (item === undefined) return undefined;
return Object.prototype.toString.call(item).slice(8, -1);
}
// 返回 String Function Boolean Object Number
获取 cookie
// 获取 document 下 cookie 的具体某个参数值
export function getCookie(key) {if (key === undefined) {return undefined;}
let cookies = document.cookie;
let mReg = new RegExp('(^|;)\\s*' + key + '=([^;]*)(;|$)');
let mValue = cookies.match(mReg);
let ret = undefined;
if (mValue != null) {ret = unescape(mValue[2]);
}
if (ret !== undefined) {ret = ret.replace(/^\"|\'/i, '').replace(/\"|\'$/i,'');
}
return ret;
}
版本号比照
个别在做 APP 端开发的时候须要用到一些版本控制,那么就须要针对版本号来进行比照,高版本或者低版本做一些非凡的逻辑解决,上面就是提供版本比照的办法
// 传入要比照的版本号,个别后面一个传入以后的版本号,前面一个写上要比照的版本号
export function versionCompare(higher, lower) {let sep = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : '.';
let higherAry = higher.split(sep),
lowerAry = lower.split(sep);
let l = Math.max(higherAry.length, lowerAry.length);
for (let i = 0; i < l; i++) {let high = parseInt(higherAry[i] || 0);
let low = parseInt(lowerAry[i] || 0);
if (high > low) {return 1;}
if (high < low) {return -1;}
}
return 0;
}
// 返回值 higher > lower: 1;higher = lower: 0;higher < lower:-1
数组去重
export function arrayUniq(array){let temp = [];
for(var i = 0; i < array.length; i++){if(temp.indexOf(array[i]) == -1){temp.push(array[i]);
}
}
return temp;
}
iPhone X 系列机型判断
export function isIphoneX() {
// iPhone X、iPhone XS
var isIPhoneX =
/iphone/gi.test(window.navigator.userAgent) &&
window.devicePixelRatio &&
window.devicePixelRatio === 3 &&
window.screen.width === 375 &&
window.screen.height === 812;
// iPhone XS Max
var isIPhoneXSMax =
/iphone/gi.test(window.navigator.userAgent) &&
window.devicePixelRatio &&
window.devicePixelRatio === 3 &&
window.screen.width === 414 &&
window.screen.height === 896;
// iPhone XR
var isIPhoneXR =
/iphone/gi.test(window.navigator.userAgent) &&
window.devicePixelRatio &&
window.devicePixelRatio === 2 &&
window.screen.width === 414 &&
window.screen.height === 896;
if (isIPhoneX || isIPhoneXSMax || isIPhoneXR) {return true;}
return false;
}
正文完