错误的写法：0 < i < 100
正确的写法：0 < i && i < 100
常年写JAVA后端，习惯了区间判断使用 “0 < x < 100”这种形式，今天在JS中使用区间判断发现出问题了
if(Math.round(i/custList.length*100) <= 20) {
iconPng = path+"/icdc/crpt/css/images/bmap/1.png";
} else if (20 < Math.round(i/custList.length*100) <= 40) {
iconPng = path+"/icdc/crpt/css/images/bmap/2.png";
} else if (40 < Math.round(i/custList.length*100) <= 60) {
iconPng = path+"/icdc/crpt/css/images/bmap/3.png";
} else if (60 < Math.round(i/custList.length*100) <= 80) {
iconPng = path+"/icdc/crpt/css/images/bmap/4.png";
} else if (80 < Math.round(i/custList.length*100) <= 100) {
iconPng = path+"/icdc/crpt/css/images/bmap/5.png";
}百度地图显示标注，按排序后百分比显示不同标注颜色，使用上面代码只显示1.png和2.png两种，折腾半天才发现原来是要分开判断，
例如20 < Math.round(i/custList.length*100) <= 40
如果不分开判断，可能就只取20 < Math.round(i/custList.length*100)这部分，所以造成了上述现象，改成如下代码后恢复正常
if(Math.round(i/custList.length*100) <= 20) {
iconPng = path+"/icdc/crpt/css/images/bmap/1.png";
} else if (20 < Math.round(i/custList.length*100) && Math.round(i/custList.length*100) <= 40) {
iconPng = path+"/icdc/crpt/css/images/bmap/2.png";
} else if (40 < Math.round(i/custList.length*100) && Math.round(i/custList.length*100) <= 60) {
iconPng = path+"/icdc/crpt/css/images/bmap/3.png";
} else if (60 < Math.round(i/custList.length*100) && Math.round(i/custList.length*100) <= 80) {
iconPng = path+"/icdc/crpt/css/images/bmap/4.png";
} else if (80 < Math.round(i/custList.length*100) && Math.round(i/custList.length*100) <= 100) {
iconPng = path+"/icdc/crpt/css/images/bmap/5.png";
}