$("#grid-container").append('<div class="number-cell" id="number-cell-"+i+"-"+j+""></div>')怎么修改??
append('<div class="number-cell" id="number-cell-'+i+"-"+j+'"></div>')单引号匹配有问题,试试这样:
$("#grid-container").append('<div class="number-cell" id="number-cell-"'+i+"-"+j+'"></div>')